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4. Study of the convergence rate of variational-difference schemes for a second-order elliptic equation in a two-dimensional domain;Oganesyan;Zh. vȳchisl. Mat. mat. Fiz.,1969
5. The order for choosing the iterative parameters in the Chebyshev cyclical iterative method;Lebedev;Zh. vȳchisl. Mat. mat. Fiz.,1971