1. Foundations of the general theory of functions of a complex variable;Riemann,1948
2. Introduction to the theory of difference schemes;Godunov,1962
3. On the regularization of difference schemes;Samarskii;Zh. vȳchisl. Mat. mat. Fiz.,1967
4. On the construction of iterative methods on the basis of spectrally equivalent operators;Dyakonov;Zh. vȳchisl. Mat. mat. Fiz.,1966
5. On the numerical solution of the heat conduction problems in two and three space variables;Douglas;Trans. Am. math. Soc.,1956