1. R. Courant and D. Hilbert: Methoden der Mathematischen Physik II, Springer Verlag, Berlin (1937).
2. L.V. Kantorovich and V.I. Krylov: Approximation Methods in Higher Mathematical Analysis, Leningrad, Fizmatgiz (1962) (in Russian).
3. S.L. Sobelev: On the Shwarz method in elasticity theory, DAN SSSR 6(4), (1936) (in Russian).
4. K. Kalik: On convergence of the Shwarz algorithm, IVUZ, Matem 1959(1) (in Russian).
5. E.N. Nikolsky: The Shwarz method in elasticity theory problems with a given traction vector on the boundary DAN SSSR 135[3] (1960) (in Russian).