1. Chetaev, N. G.: 1962,The Stability of Motion (in Russian), Gostekhizdat.
2. Duboshin, G. N.: 1964,Celestial Mechanics. Analytical and Qualitative Methods (in Russian), Science.
3. Farquhar, R. W.: 1967, ?Station-Keeping in the Vicinity of Collinear Libration Points with an Application to a Lunar Communications Problem?, Space Flight Mech. Specialist Sympos., Denver, Colo., 1966, Washington, D.C.,Am. Astronaut Soc., pp. 519?535.
4. Magnus, K.: 1971,Theorie und Anwendungen, Springer-Verlag, Berlin, Heidelberg, New York.
5. Mercin, D. R.: 1956,Gyroscopic Systems (in Russian), Gostekhizdat.