1. Goolin, A.V., Ionkin, N.I., and Morozova, V.A., Difference Schemes with Nonlocal Boundary Conditions, Comput. Methods Appl. Math., 2001, vol. 1, no. 1, pp. 62–71.
2. Gulin, A.V. and Morozova, V.A., On a Family of Nonlocal Difference Schemes, Differ. Uravn., 2009, vol. 45, no. 7, pp. 1001–1013.
3. Gulin, A.V., Ionkin, N.I., and Morozova, V.A., On the Stability of a Nonlocal Two-Dimensional Difference Problem, Differ. Uravn., 2001, vol. 37, no. 7, pp. 926–932.
4. Cahlon, B., Kulkarni, D.M., and Shi, P., Stepwise Stability for the Heat Equation with a Nonlocal Constraint, SIAM J. Numer. Anal., 1995, vol. 32, no. 2, pp. 571–593.
5. Sapagovas, M., On the Stability of a Finite-Difference Scheme for Nonlocal Parabolic Boundary Value Problems, Lithuanian Math. J., 2008, vol. 48, no. 3, pp. 339–356.