## Contents of Volume 57, Number 196

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- Variational formulation of a model free-boundary problem
- Patricia Saavedra and L. Ridgway Scott PDF
- Math. Comp.
**57**(1991), 451-475

- Stability analysis of the nonlinear Galerkin method
- R. Temam PDF
- Math. Comp.
**57**(1991), 477-505

- Mixed finite element methods for compressible miscible displacement in porous media
- So-Hsiang Chou and Qian Li PDF
- Math. Comp.
**57**(1991), 507-527

- Nonconforming finite element methods for the equations of linear elasticity
- Richard S. Falk PDF
- Math. Comp.
**57**(1991), 529-550

- On the continuity in $\textrm {BV}(\Omega )$ of the $L^ 2$-projection into finite element spaces
- Bernardo Cockburn PDF
- Math. Comp.
**57**(1991), 551-561

- Counterexamples concerning a weighted $L^ 2$ projection
- Jinchao Xu PDF
- Math. Comp.
**57**(1991), 563-568

- Convergence of the two-point upstream weighting scheme
- Marie-Claude Viallon PDF
- Math. Comp.
**57**(1991), 569-584

- Convergence results for pseudospectral approximations of hyperbolic systems by a penalty-type boundary treatment
- Daniele Funaro and David Gottlieb PDF
- Math. Comp.
**57**(1991), 585-596

- Approximation of some diffusion evolution equations in unbounded domains by Hermite functions
- Daniele Funaro and Otared Kavian PDF
- Math. Comp.
**57**(1991), 597-619

- Optimal-order error estimates for the finite element approximation of the solution of a nonconvex variational problem
- Charles Collins and Mitchell Luskin PDF
- Math. Comp.
**57**(1991), 621-637

- Numerical approximations of algebraic Riccati equations for abstract systems modelled by analytic semigroups, and applications
- I. Lasiecka and R. Triggiani PDF
- Math. Comp.
**57**(1991), 639-662

- On the implementation of singly implicit Runge-Kutta methods
- G. J. Cooper PDF
- Math. Comp.
**57**(1991), 663-672

- The modified Newton method in the solution of stiff ordinary differential equations
- Roger Alexander PDF
- Math. Comp.
**57**(1991), 673-701

- Chebyshev-Vandermonde systems
- Lothar Reichel and Gerhard Opfer PDF
- Math. Comp.
**57**(1991), 703-721

- Infinitely differentiable generalized logarithmic and exponential functions
- Peter Walker PDF
- Math. Comp.
**57**(1991), 723-733

- Structural properties for two classes of combined random number generators
- Pierre L’Ecuyer and Shu Tezuka PDF
- Math. Comp.
**57**(1991), 735-746

- A tabulation of oriented links
- Helmut Doll and Jim Hoste PDF
- Math. Comp.
**57**(1991), 747-761

- A family of cyclic quartic fields arising from modular curves
- Lawrence C. Washington PDF
- Math. Comp.
**57**(1991), 763-775

- Complete solutions to families of quartic Thue equations
- Attila Pethő PDF
- Math. Comp.
**57**(1991), 777-798

- Solving a specific Thue-Mahler equation
- N. Tzanakis and B. M. M. de Weger PDF
- Math. Comp.
**57**(1991), 799-815

- Ideal 9th-order multigrades and Letac’s elliptic curve
- C. J. Smyth PDF
- Math. Comp.
**57**(1991), 817-823

- The distribution of Lucas and elliptic pseudoprimes
- Daniel M. Gordon and Carl Pomerance PDF
- Math. Comp.
**57**(1991), 825-838

- The prime factors of Wendt’s binomial circulant determinant
- Greg Fee and Andrew Granville PDF
- Math. Comp.
**57**(1991), 839-848

- A search for aliquot cycles below $10^ {10}$
- David Moews and Paul C. Moews PDF
- Math. Comp.
**57**(1991), 849-855

- Improved techniques for lower bounds for odd perfect numbers
- R. P. Brent, G. L. Cohen and H. J. J. te Riele PDF
- Math. Comp.
**57**(1991), 857-868

- Reviews and Descriptions of Tables and Books
- Math. Comp.
**57**(1991), 869-880