1. Theory of Elasticity;Timoshenko,1975
2. A relaxation method for solving difference elliptic equations;Fedorenko;Zh. vychisl. Mat. mat. Fiz.,1961
3. On the convergence of one relaxation method with natural constraints on the elliptic operator;Bakhvalov;Zh. vychisl. Mat. mat. Fiz.,1966
4. On the use of sequences of grids in the solution of strongly elliptic systems;D'yakonov,1977
5. On the convergence of multigrid iterations;Hachbusch;Beiträge Numer. Math.,1981