1. Arutjunjan, N.H., Abramjan, B.L.: Krucenie uprugih tel, Gosudarstvennoe isdatel'stvo fizico-matemati?eskoj literatury, Moskva 1963
2. Badea, L.: Remarks concerning the convergence of the Jacobi and Gauss-Seidel iterative processes for the positive definite, symmetric systems of linear equations. Rev. Roum. Math. Pures. Appl.8, 1153?1165 (1981)
3. C�a, J., Glowinski, R.: Sur des m�thodes d'optimisation par relaxation. RAIRO, d�cembre 1973
4. Ciarlet, P.G.: Num�rical analysis of the finite Element Method. Les Presses de l'Univ. de Montreal 1976
5. Godounov, S.: Equations de la Physique Math�matique, Mir, Mocou 1973