1. A. B. Bakushinskii and A. V. Goncharskii, Iterative Solution Methods for Ill-Posed Problems (Nauka, Moscow, 1989) [in Russian].
2. A. B. Bakushinskii and M. Yu. Kokurin, Iterative Methods for Solving Ill-Posed Operator Equations with Smooth Operators (Editorial URSS, Moscow, 2002) [in Russian].
3. A.N. Tikhonov, A. S. Leonov, and A. G. Yagola, Nonlinear Ill-Posed Problems (Fizmatlit, Moscow, 1995) [in Russian].
4. M. A. Krasnosel’skii, G. M. Vainikko, P. P. Zabreiko, et al., Approximate Solution of Operator Equations (Nauka, Moscow, 1969) [in Russian].
5. V. A. Trenogin, Functional Analysis (Nauka, Moscow, 1980) [in Russian].