1. I. D. Zhongolovich, Transactions of the Institute of Theoretical Astronomy, No. III (in Russian), Academy of Sciences of the U.S.S.R. Press. 1952.
2. A. A. Mikhailov, Course in Gravimetry and Theory of the Earth’s Figure (in Russian), GUGK Press, 1939.
3. N. I. Idelson, Potential Theory (Russian translation), ONTI, 1936.
4. G. K. Suslov, Theoretical Mechanics (in Russian), GTTI, 1946.
5. C. Jacobi, Lectures on Dynamics (Russian translation), GTTI, 1936.