1. Babuska I. Pràger M., Vitàsek E. Numerical processes in differential equations-Interscience 1966
2. Bahvalov N. S. Foundations of numerical analysis – (1970) Moscow (Russian)
3. Berezin I. S., Zhidkov N. P. Computing methods –Pergamon Press –Oxford 1965,2 vols.
4. Wasow W., Forsythe G. Finite difference methods for partial differential equations – J. Wiley and Sons (1959).
5. Voevodin V. V. Numerical methods of algebra. Theory and algorithms. “Nauka” Moscow 1966 (Russian)