1. V. G. Prikazchikov, “Difference eigenvalue problem for an elliptic operator,” Zh. Vych. Mat. Mat. Fiz., Vol. 5, No. 4, 648–657 (1965).
2. V. G. Prikazchikov, “Difference eigenvalue problem for a fourth-order elliptic operator,” Zh. Vych. Mat. Mat. Fiz., Vol. 17, No. 6, 1432–1442 (1977).
3. V. G. Prikazchikov, “A conservative difference scheme for an eigenvalue problem in a domain with a smooth boundary,” Diff. Uravneniya, Vol. 16, No. 7, 1303–1307 (1980).
4. V. G. Prikazchikov, “A difference eigenvalue problem for a second-order elliptic operator with mixed boundary conditions,” Zh. Vych. Mat. Mat. Fiz., Vol. 22, No. 3, 655–662 (1982).
5. V. L. Makarov and V. G. Prikazchikov, “On the accuracy of the grid method in eigenvalue problems,” Diff. Uravneniya, Vol. 18, No. 7, 1240–1244 (1982).