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3. A. B. Bakushinskii, Selected Topics of Approximate Solution of Ill-Posed Problems (Mosk. Gos. Univ., Moscow, 1968) [in Russian].
4. V. A. Trenogin and N. A. Sidorov, “On the Tikhonov Regularization of the Problems of Bifurcation Points of Non-linear Operators,” Sib. Mat. Zh. 17, 402–413 (1976).
5. I. K. Lifanov, “On the Ill-Posedness and Regularization of the Numerical Solution to Singular Integral Equations,” Dokl. Akad. Nauk SSSR 255, 1046–1050 (1980).