1. Introduction to the Theory of Stability of Motion;Merkin,1971
2. The Stability of Motion;Chetaev,1961
3. The Kelvln-Tait-Chetaev theorem and extensions;Zajac;J. Astronaut. Sci.,1964
4. Gyroscopic Systems;Merkin,1956
5. Onthe stability of nonconservative systems;Agafonov;Vestn. Moskovsk. Gos. Univ., Ser. Matern., Mekhan.,1972