1. V. N. Sorokin, Speech inversion: Problems and solutions, in Dynamics of Speech Production and Perception, Ed. by P. Divenyu, S. Greenberg, and G. Meyer, (IOS, 2006), p. 263, [in Russian].
2. V. N. Sorokin, Speech inversion in physiology and technology, in Speech Communication at the Leading Edge, Ed. by R. H. Yablonski, (Nova Science, 2008), [in Russian].
3. A. S. Leonov and V. N. Sorokin, Dokl. Mathem. 84, 740 (2011).
4. A. S. Leonov and V. N. Sorokin, Dokl. Mathem. 85, 432 (2012).
5. A. N. Tikhonov and V. Ya. Arsenin, Methods of Solution of Ill-Posed Problems, (Nauka, Moscow, 1979), 2nd ed., [in Russian].