1. R. Lattès and J.-L. Lions, Méthode de quasi-réversibilité et applications (Dunod, Paris, 1967; Mir, Moscow, 1970).
2. A. N. Tikhonov and V. Ya. Arsenin, Methods for Solving Ill-Posed Problems (Nauka, Moscow, 1974) [in Russian].
3. V. K. Ivanov, V. V. Vasin„ and V. P. Tanana, Theory of Linear Ill-Posed Problems and Applications (Nauka, Moscow, 1978) [in Russian].
4. M. M. Lavrent’ev, V. G. Romanov, and S. P. Shishatskii, Ill-Posed Problems of Mathematical Physics (Nauka, Moscow, 1980) [in Russian].
5. A. A. Samarskii and P. N. Vabishchevich, Numerical Methods for Solving Inverse Problems of Mathematical Physics (Editorial URSS, Moscow, 2004) [in Russian].