1. Applied Mathematics Series;Forsythe, George E.,1960
2. On the linear iteration procedures for symmetric matrices;Ostrowski, A. M.;Rend. Mat. e Appl. (5),1954
3. Relaxation methods for linear equations;Schechter, Samuel;Comm. Pure Appl. Math.,1959
4. Über die partiellen Differenzengleichungen der mathematischen Physik;Courant, R.;Math. Ann.,1928
5. On mildly nonlinear partial difference equations of elliptic type;Bers, Lipman;J. Research Nat. Bur. Standards,1953