1. Chaplygin, S.A., On a Motion of a Heavy Body of Revolution on a Horizontal Plane, Regul. Chaotic Dyn., 2002, vol. 7, no. 2, pp. 119–130.
2. Routh, E. J., A Treatise on the Dynamics of a System of Rigid Bodies: P. 2. The Advanced Part, 6th ed., New York: Macmillan, 1905; see also: New York: Dover, 1955 (reprint).
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5. Astapov, I. S., On Rotational Stability of Celtic Stone, Vestn. Mosk. Univ. Ser. 1. Mat. Mekh., 1980, no. 2, pp. 97–100 (Russian).