1. F. Brezzi and M. Fortin, Mixed and Hybrid Finite-element methods (Springer-Verlag, New York, 1991).
2. P. A. Raviart and J. M. Thomas, A Mixed Finite-element method for 2-nd Order Elliptic Problems (Springer-Verlag, Berlin, 1977).
3. Samarskii, A.A. and Nikolaev, B.S., Solution Methods for Grid Difference Equations (Nauka, Moscow, 1978) [in Russian].
4. T. A. Bukina, “Operator Alternating-Triangular Method for Three-Dimensional Static Problem in Elasticity Theory,” Bull. Novosibirsk Comp. C. Ser. Numer. Anal. No. 6, 29–36 (1995).
5. V. V. Voevodin and Yu. A. Kuznetsov, Matrices and Calculations (Nauka, Moscow, 1984) [in Russian].