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3. A. N. Tikhonov and V. Ya. Arsenin, Solutions of Ill-Posed Problems (Nauka, Moscow, 1979; Wiley, New York, 1981)
4. V. K. Ivanov, V. V. Vasin, and V. P. Tanana, Theory of Linear Ill-Posed Problems and Its Applications (Nauka, Moscow, 1978; VSP, Utrecht, 2002).
5. S. I. Kabanikhin, Inverse and Ill-Posed Problems (Sibirsk. Nauchn. Izd., Novosibirsk, 2009; De Gruyter, Berlin, 2011).