1. The proof of Kolmogorov's theorem on the conservation of conditionallyperiodic motions at small variations of Hamilton's function;Arnol'd;Uspekhi Matem. Nauk,1963
2. New periodic solutions for the problem of motion of a heavy solid body around a fixed point;Kozlov;PMM,1975
3. Lectures on the Integration of Equations of Motion of a Heavy Rigid Body about a fixed point;Golubev,1953
4. Linear methods in problems of nonlinear differential equations with a small parameter;Povzner;Internat. J. Nonlinear Mech.,1974
5. On the problem of geometric interpretation of integrals of motion of a rigid body about a fixed point;Delaunay;Matem. Sb.,1891