1. I. M. Gel’fand, I. M. Gindikin, and S. G. Graev, Selected problems of Integral Geometry (Dobrosvet, Moscow, 2000) [inRussian].
2. S. Helgasson, The Radon Transform (Birkhauser, Boston, 1980)
3. N. S. Koshlyakov, E. B. Gliner, and M. M. Smirnov, Fundamental Differential Equations of Mathemathical Physics (Fizmatgiz, Moscow, 1962) [inRussian].
4. V. I. Krylov and L. T. Shul’gina, Numerical Integration Handbook (Nauka, Moscow, 1966) [inRussian].
5. I. E. Stepanova, “Testing of Computer Technologies of the S-Approximation with the Use of Detailed Gravity and Magnetic Surveys,” Fizika Zemli, No.6, 88 (2004) [Izvestiya, Physics of the Solid Earth 40, 534 (2004)].