1. Zvang, F.: Matrix theory. Basic results and techniques. Springer (1999)
2. Kalis, H., Buikis, A.: Method of lines and finite difference schemes with the exact spectrum for solution the hyperbolic heat conduction equation. Mathematical Modelling and Analysis 16(2), 220–232 (2011)
3. Kalis, H., Rogovs, S.: Finite differehce schemes with exact spectrum for solving differential equations with boundary conditions of the first kind. Int. Journ. of Pure and Applied Mathematics -IJPAM 71(1), 159–172 (2011)
4. Makarov, V.L., Gavrilyuk, I.P.: On constructing the best net circuits with the exact spectrum Dopov. Akad. Nauk Ukr. RSR, Ser. A, 1077–1080 (1975) (in Ukrainian)
5. Samarskij, A.A.: Theory of finite difference schemes Moscow. Nauka (1977) (in Russian)