1. On linear and non-linear elliptic boundary value problems in the plane;Bers,1954
2. Finite-Difference Methods for Partial Differential Equations;Forsythe,1960
3. Elliptic difference equations on a convex domain;Guilinger,1967
4. Dirichlet problems for mildly nonlinear elliptic difference equations;McAllister;J. Math. Anal. Appl.,1969
5. Discrete Green's functions;McAllister;Math. Comp.,1973