1. M.M. Lavrentyev, L.Ya. Savelyev, Operator theory and ill-posed problems, Publishing house of the Institute of Mathematics, Moscow, 2010.
2. S.I. Kabanikhin, Inverse and ill-posed problems, Siberian Scientific Publishing House, 2009.
3. M. Reed, B. Simon, Methods of Modern Mathematical Physics: Functional Analysis, Rev. ed. Academic press, 1980.
4. S. Helgason, Integral Geometry and Radon Transform, Springer, New York, 2011.
5. F. Natterer, The mathematics of computerized tomography, Classics in Mathematics. Society for Industrial and Applied Mathematics, New York, 2001.