1. Kerimov, I.A., Metod F-approksimatsii pri reshenii zadach gravimetrii i magnitometrii (The Method of F-Approximations in Solving the Problems of Gravimetry and Magnetometry), Moscow: Fizmatlit, 2011.
2. Koshlyakov, N.S., Gliner, E.B., and Smirnov, M.M., Osnovnye differentsial’nye uravneniya matematicheskoi fiziki (Main Differential Equations of Mathematical Physics), Moscow: Fizmatgiz, 1962.
3. Lavrentiev, M.A. and Lyusternik, L.A., Kurs variatsionnogo ischisleniya (A Course in Variational Calculus), Moscow-Leningrad: Gostoptekhizdat, 1950.
4. Raevskiy, D.N. and Stepanova, I.E., On the solution of inverse problems of gravimetry by the modified method of S-approximations, Izv., Phys. Solid Earth, 2015a, vol. 51, no. 2, pp. 207–218.
5. Raevskiy, D.N. and Stepanova, I.E., The modified method of S-approximations: regional version, Izv., Phys. Solid Earth, 2015b, vol. 51, no. 2, pp. 197–206.