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Robert Piessens and Luc Wuytack Editorial . . . . . . . . . . . . . . . 3--3 O. Axelsson High-order methods for parabolic problems . . . . . . . . . . . . . . . . 5--16 I. M. Longman Application of best rational function approximation for Laplace transform inversion . . . . . . . . . . . . . . . 17--23 C. L. Wu and R. J. Adler Nonlinear matrix algebra and engineering applications. Part 1: Theory and linear form matrix . . . . . . . . . . . . . . 25--37 Robert Meersman A survey of techniques in applied computational complexity . . . . . . . . 39--46 P. Breesch and J. De Kerf and M. Goovaerts A note on the numerical evaluation of integrals over strongly oscillating functions . . . . . . . . . . . . . . . 47--49 Anonymous Book Review: \booktitleAdaptation of a linear system to a finite set of patterns occurring in an arbitrarily varying order: Teuvo Kohonen, Erkki Oja and Matti Ruohonen; Acta Polytechnica Scandinavica, Mathematics and Computing Machinery series No. 25 . . . . . . . . 50--50 R. De Meersman A method for least squares solution of systems with a cyclic rectangular coefficient matrix . . . . . . . . . . . 51--54 Maria Branders and Robert Piessens An extension of Clenshaw--Curtis quadrature . . . . . . . . . . . . . . . 55--65
Avram Sidi Computation of the Chebyshev--Padé table 69--71 Jozef Miklosko A recursive computation of the determinant of a pentadiagonal matrix 73--78 Robert Piessens and Ann Haegemans Cubature formulas of degree eleven for symmetric planar regions . . . . . . . . 79--83 Guy Latouche Optimal allocation of priority in a M/M/1 queue with two types of customers 85--91 G. Paiano and D. Picca Integral transforms as computational tools in quantum mechanics . . . . . . . 93--100 Joseph L. F. De Kerf The interpolation method of Sprague--Karup . . . . . . . . . . . . . 101--110 Chorkin Chan and Melvin Klassen A performance comparison study between subroutine packages LINSYS, IBMSSP and IMSL for solving systems of linear equations . . . . . . . . . . . . . . . 111--113 Robert Piessens A bibliography on numerical inversion of the Laplace transform and applications 115--128
W. Niethammer and J. Schade On a relaxed SOR-method applied to nonsymmetric linear systems . . . . . . 133--136 Maurice M. Mizrahi Generalized Hermite polynomials . . . . 137--140 G. Claessens A new look at the Padé table and the different methods for computing its elements . . . . . . . . . . . . . . . . 141--152 Robert Piessens and Maria Branders Computation of oscillating integrals . . 153--164 P. Dierckx An algorithm for smoothing, differentiation and integration of experimental data using spline functions 165--184 W. Meeusen and L. Cuyvers Clique detection in directed graphs: a new algorithm . . . . . . . . . . . . . 185--203 Joseph L. F. De Kerf A bibliography on fuzzy sets . . . . . . 205--212 Hans J. Stetter and Christoph W. Ueberhuber Proposal for population studies in numerical quadrature . . . . . . . . . . 213--215
Marvin I. Freedman and James L. Kaplan Use of a non-linear clock in the perturbation analysis of time optimal control problems . . . . . . . . . . . . 219--228 Avram Sidi On the approximation of square-integrable functions by exponential series . . . . . . . . . . . 229--234 T. Kloek and F. B. Lempers Post-experiment introduction of constraints on parameters . . . . . . . 235--237 F. D. Peschanel An approach to a consistent qualification of decision procedures in probabilistic information processing . . 239--245 Anonymous State estimation of polynomial type non-linear differential systems: Jussi Orava; Acta Polytechnica Scandinavica, Mathematics and Computing Machinery series No. 25 . . . . . . . . . . . . . 246--246 David Levin Numerical inversion of the Laplace transform by accelerating the convergence of Bromwick's integral . . . 247--250 Abdel-Wahab M. Nourein An iteration formula for the simultaneous determination of the zeros of a polynomial . . . . . . . . . . . . 251--254 P. J. Reddy and H.-J. Zimmermann and Asghar Husain Numerical experiments on DFP-method, a powerful function minimization technique 255--265 L. Wuytack Numerical integration by using nonlinear techniques . . . . . . . . . . . . . . . 267--272 Maurice M. Mizrahi Generalized Hermite polynomials . . . . 273--277 E. H. Mund and P. Hallet and J. P. Hennart An algorithm for the interpolation of functions using quintic splines . . . . 279--288 Anonymous Contents of volume 1, 1975 . . . . . . . 289--289
Joseph Roseman and Gideon Zwas On the correct numerical shock speed . . 3--6 Torsten Ström and Per Svensson On the determination of an orthogonal transformation . . . . . . . . . . . . . 7--11 Anadi Kumar Chatterjee and Lokenath Debnath Nonlinear mathematical model of the junction of tidal rivers . . . . . . . . 13--18 C. E. Siewert and E. E. Burniston An exact analytical solution of $ x \coth x = \alpha x^2 + 1 $ . . . . . . . 19--21 S. S. Sastry Finite difference approximations to one-dimensional parabolic equations using a cubic spline technique . . . . . 23--26 A. Wambecq Nonlinear methods in solving ordinary differential equations . . . . . . . . . 27--33 J. S. Ansari A theorem on asymptotic behaviour of functional equations and its applications . . . . . . . . . . . . . . 35--39 P. R. Graves-Morris and R. Hughes Jones An analysis of two variable rational approximants . . . . . . . . . . . . . . 41--48 D. Picca Laplace-transform approach to the quantal Coulomb problem . . . . . . . . 49--54 N. De Pril and L. D'Hooge and M. J. Goovaerts A bibliography on credibility theory and its applications . . . . . . . . . . . . 55--62 R. De Meersman A derivation of the Levinson algorithm for solving linear systems with symmetric positive definite Toeplitz matrix . . . . . . . . . . . . . . . . . 63--65 B. Danloy On the choice of signs for Householder's matrices . . . . . . . . . . . . . . . . 67--69 A. Bultheel Book Review: Ph. Th. Stol, \booktitleNonlinear parameter optimization: H. Veenman en Zonen B.V., Centre for Agricultural Publishing and Documentation, Wageningen 1975, 24 cm $ \times $ 17 cm, 197 pages . . . . . . . 70--70
J. S. R. Chisholm and A. C. Genz and M. Pusterla A method for computing Feynman amplitudes with branch cuts . . . . . . 73--76 M. Razzaghi On the Jacobi condition for optimizing an engineering problem . . . . . . . . . 77--80 Frank Lether On Birkhoff--Young quadrature of analytical functions . . . . . . . . . . 81--84 Yudell L. Luke Chebyshev expansions and rational approximations . . . . . . . . . . . . . 85--93 C. M. Crane and D. M. Burley Numerical studies of laminar flow in ducts and pipes . . . . . . . . . . . . 95--111 Claude Brezinski Computation of Padé approximants and continued fractions . . . . . . . . . . 113--123 Jozef L. Teugels A bibliography on semi-Markov processes 125--144 D. Nerinckx and A. Haegemans A comparison of non-linear equation solvers . . . . . . . . . . . . . . . . 145--148
L. R. Shenton and K. O. Bowman A new algorithm for summing divergent series. Part 1. Basic theory and illustrations . . . . . . . . . . . . . 151--167 C. L. Wu and R. J. Adler Nonlinear matrix algebra and engineering applications. Part 2: Polynomial form matrices . . . . . . . . . . . . . . . . 169--185 Avram Sidi Best rational function approximation to Laplace transform inversion using a window function . . . . . . . . . . . . 187--194 Haluk Bekiro\uglu and Keith L. McRoberts Mathematical analysis of a shuttle system based on two interdependent queues . . . . . . . . . . . . . . . . . 195--206 Paul van Dooren and Luc de Ridder An adaptive algorithm for numerical integration over an $n$-dimensional cube 207--217 Anonymous Erratum: A method for computing Feynman amplitudes with branch cuts [J. Comput. Appl. Math. \bf 2(2) 73--76 (1976)] . . 218--218 Anonymous Book Review: \booktitleA theory for optimal PI-control of multivariable linear systems: Gustafsson, Sten E.: Acta Polytechnica Scandinavica, Mathematics and Computer Science Series No. 27. Helsinki 1975. 31 pp. ISBN 951-666-069-X . . . . . . . . . . . . . 218--218 Frank G. Lether Computation of double integrals over a triangle . . . . . . . . . . . . . . . . 219--224 R. Piessens and N. D. P. Dang A bibliography on numerical inversion of the Laplace transform and applications: a supplement . . . . . . . . . . . . . . 225--228
J. Devooght Analytic continuation by reproducing kernel methods combined with Padé approximations . . . . . . . . . . . . . 231--239 Herbert E. Salzer A new form of trigonometric orthogonality and Gaussian-type quadrature . . . . . . . . . . . . . . . 241--248 Jesus Sánchez-Dehesa On the conditions for a Hamiltonian matrix to have an eigen-value density with some prescribed characteristics . . 249--254 M. Pindor A simplified algorithm for calculating the Padé table derived from Baker and Longman schemes . . . . . . . . . . . . 255--257 K. O. Bowman and L. R. Shenton A new algorithm for summing divergent series. Part 2: a two-component Borel summability model . . . . . . . . . . . 259--266 Augustin Paulik On the optimal approximation of bounded linear functionals in Hilbert spaces with inner product invariant in rotation or translation . . . . . . . . . . . . . 267--272 E. De Doncker and R. Piessens A bibliography on automatic integration 273--279 Anonymous Contents of volume 2, 1976 . . . . . . . 282--282
Frank G. Lether Modified quadrature formulas for functions with nearby poles . . . . . . 3--9 N. Papamichael and J. R. Whiteman Letter to the editors . . . . . . . . . 10--10 Celia Andrade and S. McKee High accuracy A.D.I. methods for fourth order parabolic equations with variable coefficients . . . . . . . . . . . . . . 11--14 S. K. Dey Perturbed iterative solution of nonlinear equations with applications to fluid dynamics . . . . . . . . . . . . . 15--30 Jerzy Rayski A refined Born approximation . . . . . . 31--34 L. R. Shenton and K. O. Bowman A new algorithm for summing divergent series: Part 3: Applications . . . . . . 35--51 M. F. Neuts An annoted bibliography on computational probability: Part 1 . . . . . . . . . . 53--74 R. de Groot Book Review: \booktitleMathematical systems theory: Lecture notes in economics and mathematical systems. Vol. 131. Proceedings of the International Symposium, Udine, Italy, June 1975, Marchesini G., Padua, Italy and Mitter, S. K., Massachusetts Institute of Technology, USA, editors. Springer Verlag, New York 1976, 408 pages . . . . 75--76
R. C. Johnson Interpolation by local space curves . . 79--84 A. E. Cook and R. D. Gibson Fifth and sixth order PECE algorithms based on $g$-splines with improved stability characteristics . . . . . . . 85--87 J. Oliver On the sensitivity to rounding errors of Chebyshev series approximations . . . . 89--98 Udo Ebert Computation of optimal radiation treatment plans . . . . . . . . . . . . 99--104 John J. Spitzer A numerically stable and efficient technique for the maintenance of positive definiteness in the Hessian for Newton-type methods . . . . . . . . . . 105--108 A. W. Nourein An improvement on Nourein's method for the simultaneous determination of the zeroes of a polynomial (An algorithm) 109--112 P. Dierckx An algorithm for least-squares fitting of cubic spline surfaces to functions on a rectilinear mesh over a rectangle . . 113--129 David J. Evans Computation of eigenvalues and eigenvectors of a symmetric quindiagonal matrix . . . . . . . . . . . . . . . . . 131--141
Donald Greenspan Computer studies of interactions of particles with differing masses . . . . 145--154 J. G. Verwer A class of stabilized three-step Runge--Kutta methods for the numerical integration of parabolic equations . . . 155--166 Jesus Sánchez-Dehesa The asymptotical spectrum of Jacobi matrices . . . . . . . . . . . . . . . . 167--171 L. Graney The numerical solution of unstable two point boundary value problems . . . . . 173--180 Alan C. Genz A nonlinear method for the acceleration of the convergence of multidimensional sequences . . . . . . . . . . . . . . . 181--184 R. S. Dahiya Computation of $n$-dimensional Laplace transforms . . . . . . . . . . . . . . . 185--188 F. Poleunis and O. Leroy The construction of self-adjoint operators of Hill with periodic eigenfunctions . . . . . . . . . . . . . 189--194 D. M. Sloan and G. Wilks The Riccati transformation method and the computation of eigenvalues of complex linear differential systems . . 195--199 A. R. Gourlay and S. McKee The construction of hopscotch methods for parabolic and elliptic equations in two space dimensions with a mixed derivative . . . . . . . . . . . . . . . 201--206 P. Dierckx and R. Piessens Calculation of Fourier coefficients of discrete functions using cubic splines 207--209 W. D. Hoskins and D. S. Meek and D. J. Walton A rapidly convergent method for the solution of of the matrix equation XA + AY=F . . . . . . . . . . . . . . . . . . 211--215 Herbert E. Salzer Inverse Laplace transforms of osculatory and hyperosculatory interpolation polynomials using ``near-Chebyshev'' nodes . . . . . . . . . . . . . . . . . 217--217
K. Dekker Generalized Runge--Kutta methods for coupled systems of hyperbolic differential equations . . . . . . . . . 221--233 D. J. Evans and S. O. Fatunla A linear multistep numerical integration scheme for solving systems of ordinary differential equations with oscillatory solutions . . . . . . . . . . . . . . . 235--241 D. R. Brown and M. J. O'Malley The role of eigenvalues in linear feature selection theory . . . . . . . . 243--249 George Corliss and David Lowery Choosing a stepsize for Taylor series methods for solving ODE'S . . . . . . . 251--256 D. E. Roberts An analysis of double power series using rotationally covariant approximants . . 257--262 Herbert E. Salzer Minimal error difference formulas . . . 263--267 Bo Einarsson Solving a system of linear inequalities for generating test data . . . . . . . . 269--271 Jozef Miklosko An algorithm for calculating continued fractions . . . . . . . . . . . . . . . 273--275 Fl. De Vylder A new proof for a known result in risk theory . . . . . . . . . . . . . . . . . 277--279 A. Wambecq Plotting a function of two variables . . 281--291 R. De Meersman and P. Siau On updating formulas for least squares solutions and pseudo-inverses . . . . . 293--297 Anonymous 1976 Current index to statistics . . . . 298--298 M. J. Goovaerts Book Review: \booktitleOptimal controller design by nonlinear and game theoretic method, Hämäläinen, Raimo P., in: Acta Polytechnica Scandinavica, Mathematics and Computer Science Series, No. 28 (1976), ISSN 0355-2713, ISBN 951-666-086-X . . . . . . . . . . . . . 298--298 M. J. Goovaerts Book Review: \booktitlePreservation of infinite divisibility under mixing and related topics, 33, F. W. Steutel, in: Mathematical Centre Tracts. Stichting Mathematisch Centrum (1977), 1--99 . . . 298--298 Anonymous Contents of volume 3, 1977 . . . . . . . 299--299
L. R. Shenton and K. O. Bowman Generalized continued fractions and Whittaker's approach . . . . . . . . . . 3--5 E. Neuman Uniform approximation by some Hermite interpolating splines . . . . . . . . . 7--9 Brendan B. O'Shea Algorithms for the solution of systems of coupled second-order ordinary differential equations . . . . . . . . . 11--17 James P. Abbott An efficient algorithm for the determination of certain bifurcation points . . . . . . . . . . . . . . . . . 19--27 René Alt A-stable one-step methods with step-size control for stiff systems of ordinary differential equations . . . . . . . . . 29--35 E. E. Burniston and C. E. Siewert On the solution of certain algebraic equations . . . . . . . . . . . . . . . 37--39 Richard F. Melka The method of coordinate averaging . . . 41--45 Frank G. Lether On the construction of Gauss--Legendre quadrature rules . . . . . . . . . . . . 47--52 Carl P. Jeffreson and Ee-Pan Chow Least squares coefficients for a quadrature formula for Laplace transform inversion . . . . . . . . . . . . . . . 53--58 Fritz Bierbaum and Klaus-Peter Schwiertz A bibliography on Interval-mathematics 59--86
T. R. Hennessy A comparative approach to Laplace transform inversion . . . . . . . . . . 89--91 M. J. Goovaerts and P. Van Goethem On a Berry--Esseen theorem for compound Poisson processes . . . . . . . . . . . 93--100 John P. Coleman A ``refined Born approximation'' and Aitken's $ \Delta^2 $ method . . . . . . 101--103 K. O. Bowman and L. R. Shenton Asymptotic series and Stieltjes continued fractions for a gamma function ratio . . . . . . . . . . . . . . . . . 105--111 E. G. Litinsky Best approximation and numerical methods in solution of differential equations 113--116 S. K. Dey Perturbed iterative solution of coupled nonlinear systems with application to fluid dynamics . . . . . . . . . . . . . 117--128 Owe Axelsson and Trond Steihaug Some computational aspects in the numerical solution of parabolic equations . . . . . . . . . . . . . . . 129--142 Arieh Iserles $A$-acceptable exponentially fitted combinations of three Padé approximations 143--146 N. A. Abd Rabbo and A. Mattar A CUSUM test for detecting change in the transfer functions of open loop stochastic systems . . . . . . . . . . . 147--154 M. Razzaghi On the pole assignment for single-input systems with time-delays . . . . . . . . 155--157 I. Barrodale and K. B. Wilson A Fortran program for solving a nonlinear equation by Muller's method 159--166 David W. Kammler and Robert J. McGlinn A bibliography for approximation with exponential sums . . . . . . . . . . . . 167--173
M. G. de Bruin An algorithm for calculating generalized continued fractions . . . . . . . . . . 177--179 J. A. Murphy and M. R. O'Donohoe A two-variable generalization of the Stieltjes-type continued fraction . . . 181--190 E. N. Houstis The complexity of numerical methods for elliptic partial differential equations 191--197 M. J. Goovaerts Book Review: \booktitleVariational methods in mathematics, science and engineering: Karel Rektorys, (1977), 516 pp., D. Reidel Publishing Company . . . 198--198 M. K. Jain and J. S. V. Saldanha Higher order difference methods for second order two-point boundary-value problems . . . . . . . . . . . . . . . . 199--206 G. Avdelas and A. Hadjidimos Analytical eigenvalue bounds for matrices arising when discretizing the self-adjoint second order elliptic partial differential equations . . . . . 207--211 M. J. Goovaerts Book Review: \booktitleAn introduction to the regerative method for simulation analysis: M. A. Crane, A. J. Lemoine, Berlin, Springer-Verlag, 1977, 24 cm $ \times $ 17 cm. 111 p., price DM 18 . . 212--212 W. Waterschoot Book Review: \booktitleA numerical study of stiff two-point boundary values, P. W. Hemker: Mathematical Centre Tracts 80. Edited by Stichting Mathematisch Centrum, Amsterdam, 1977; 24 cm $ \times $ 16 cm; 178 blz; price f 22 . . . . . . 212--212 Dennis D. Berkey and Marvin I. Freedman A perturbation method applied to the buckling of a compressed elastica . . . 213--221 Anadi Kumar Chatterjee and Lokenath Debnath Nonlinear mathematical model of inhomogeneous tidal rivers . . . . . . . 223--227 Don R. Wilhelmsen Degree two Gaussian cubatures in the plane . . . . . . . . . . . . . . . . . 229--232
Donald Greenspan and John Collier Computer studies of planetary-type evolution . . . . . . . . . . . . . . . 235--257 M. J. Goovaerts Book Review: \booktitleDifferential games and applications: Proceedings of a workshop, Enschede, 1977: P. Hagedorn, H. W. Knobloch, G. J. Olsder, editors. Berlin, Springer-Verlag, 1977, 17 cm $ \times $ 24 cm, 236 p., 60 fig., 6 tab., price DM 24,80. . . . . . . . . . . . . 258--258 Gilbert Laporte The seriation problem and the travelling salesman problem . . . . . . . . . . . . 259--268 A. R. Gourlay and J. Ll. Morris Locally one-dimensional hopscotch methods . . . . . . . . . . . . . . . . 269--273 Jesus Sanchez-Dehesa The spectrum of Jacobi matrices in terms of its associated weight function . . . 275--283 Oliver Aberth A method for exact computation with rational numbers . . . . . . . . . . . . 285--288 Matiur Rahman On the numerical solution of the flow between a rotating and a stationary disk 289--293 G. P. Bhattacharjee and K. L. Majumder Multivariate interval interpolation . . 295--300 Anonymous Contents of volume 4, 1978 . . . . . . . obc--obc
L. Wuytack Editorial note . . . . . . . . . . . . . 2--2 André Hautot and Alphonse Magnus Calculation of the eigenvalues of Schrödinger equations by an extension of Hill's method . . . . . . . . . . . . . 3--15 Ravi P. Agarwal The numerical solution of multipoint boundary value problems . . . . . . . . 17--24 H. W. Gretton and K. A. Jukes Computations of Tauberian constants connected with equiconvergence and the quadratfrei numbers . . . . . . . . . . 25--27 R. A. Sack A numerical method for simultaneous convergence to the elements of a sequence . . . . . . . . . . . . . . . . 29--35 Jesus Sánchez-Dehesa On a general system of orthogonal $q$-polynomials . . . . . . . . . . . . 37--45 N. T. S. Evans and A. R. Gourlay Implementation of the ``Hopscotch'' technique in the numerical solution of diffusion problems . . . . . . . . . . . 47--52 Charles B. Dunham Chebyshev approximation by exponential-polynomial sums . . . . . . 53--57 R. Meire and A. Vanderbauwhede A useful result for certain linear periodic ordinary differential equations 59--61 Yair Starkand Explicit formulas for matrix-valued Padé approximants . . . . . . . . . . . . . . 63--66 A. Bultheel Remark on ``A new look at the Padé table and different methods for computing its elements'' [2] . . . . . . . . . . . . . 67--67 Richard J. Hanson Computing an interior point for inequalities using linear optimization 69--70
P. J. van der Houwen and B. P. Sommeijer and J. G. Verwer Comparing time integrators for parabolic equations in two space dimensions with a mixed derivative . . . . . . . . . . . . 73--83 J. Oliver Rounding error propagation in polynomial evaluation schemes . . . . . . . . . . . 85--97 C. E. Siewert and J. S. Phelps III On the solution of a $ \tan (\zeta - k \pi) + \tanh \zeta = 0 $ . . . . . . . . 99--101 L. Kaufman Book Review: \booktitleInteger programming and related areas --- A classified bibliography 1976--1978: Compiled at the Institut für Ökonometrie und Operations Research, University of Bonn. Edited by Dirk Hausman. 1978, xiv + 314 pages. Soft cover, DM 32, US 16. Springer-Verlag, Berlin, Heidelberg, New York. Vol. 160 of ``Lecture Notes in Economics and Mathematical Systems'', Editors M. Beckmann and H. P. Künzi . . . 102--102 A. R. Gourlay and S. McKee Hopscotch methods for elliptic partial differential equations . . . . . . . . . 103--110 David Westreich and Baruch Cahlon Numerical methods for discontinuous linear two point boundary value problems 111--115 Ravi P. Agarwal On periodic solutions of nonlinear second order differential systems . . . 117--123 N. A. Abdrabbo A new approach to the problem of estimating spectral parameters of non-stationary time series models . . . 125--129 Layne T. Watson Fixed points of $ C^2 $ maps . . . . . . 131--139 Charles B. Dunham A survey of published programs for best approximation . . . . . . . . . . . . . 141--143 Bo Einarsson Bibliography on the evaluation of numerical software . . . . . . . . . . . 145--159
Lazaros P. Mavrides Nonlinear programming with cumulatively bounded variables . . . . . . . . . . . 163--169 J. A. Snyman Continuous and discontinuous numerical solutions to the Troesch problem . . . . 171--175 Richard F. Melka Implicit perturbations . . . . . . . . . 177--182 U. Ascher and J. B. Rosen A collocation method for parabolic quasilinear problems on general domains 183--191 Stanislaw Lewanowicz Construction of a recurrence relation for modified moments . . . . . . . . . . 193--206 Ian Robinson A comparison of numerical integration programs . . . . . . . . . . . . . . . . 207--223 D. J. Rodabaugh and S. Thompson Low-order $ A_0 $-stable Adams-type correctors . . . . . . . . . . . . . . . 225--233 Dirk P. Laurie and Laurette Rolfes Computation of Gaussian quadrature rules from modified moments . . . . . . . . . 235--243
Masatoshi Ikeuchi and Hiroshi Kobayashi and Hideo Sawami and Hiroshi Niki On the spectral radius of the Jacobi iteration matrix for a rectangular region with two different media . . . . 247--258 G. Klein On spline functions and statistical regularization of ill-posed problems . . 259--264 H. Van de Vel Haar intervals for trigonometric polynomials . . . . . . . . . . . . . . 265--267 G. Avdelas and S. Galanis and A. Hadjidimos Three-level extrapolated alternating direction implicit (E.A.D.I.) methods for the numerical solution of two-dimensional second order elliptic problems . . . . . . . . . . . . . . . . 269--275 R. De Meersman Least squares with non-linear equality constraints Application to closing of balances . . . . . . . . . . . . . . . . 277--281 G. Claessens and L. Wuytack On the computation of non-normal Padé approximants . . . . . . . . . . . . . . 283--289 T. S. Chihara On generalized Stieltjes--Wigert and related orthogonal polynomials . . . . . 291--297 A. Benson and D. J. Evans A normalised algorithm for the solution of symmetric general five-term linear systems of semi-bandwidth $M$ . . . . . 299--304