1. A. A. Samarskii, Theory of Finite Difference Schemes (Nauka, Moscow, 1977; Marcel Dekker, New York, 2001).
2. V. A. Il’in and E. I. Moiseev, “Nonlocal Problem for the Sturm-Liouville Operator in the Differential and Difference Interpretation,” Dokl. Akad. Nauk SSSR 291(3), 534–540 (1986).
3. A. N. Tikhonov and A. A. Samarskii, “On Uniform Finite Difference Schemes,” Zh. Vychisl. Mat. Mat. Fiz. 1(1), 5–63 (1961).
4. V. M. Abdullaev and K. R. Aida-Zade, “On the Numerical Solution of Loaded Systems of Ordinary Differential Equations,” Zh. Vychisl. Mat. Mat. Fiz. 44(9), 1585–1595 (2004) [Comput. Math. Math. Phys. 44, 1505–1515 (2004)].
5. A. M. Nakhushev, “Loaded Equations,” Differ. Uravn. 19(1), 86–94 (1983).