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2. K. Magnus, Kreisel. Theorie und Anwendungen (Springer, Heidelberg, 1971; Mir, Moscow, 1974).
3. D. R. Merkin, Gyroscopic Systems (Nauka, Moscow, 1974) [in Russian].
4. M. Roseau, Vibrations des systemes mecaniques (Masson, Paris, 1984).
5. V. F. Zhuravlev, Fundamentals of Theoretical Mechanics (Fizmatlit, Moscow, 2001) [in Russian].