1. G. T. Walker, “On a Curious Dynamical Property of Celts,” Proc. Cambridge Phil. Soc. 8(5), 305–306 (1885).
2. G. T. Walker, “On a Dynamic Top,” Quart. J. Pure and Appl. Math. 28, 175–184 (1896).
3. A. P. Markeev, Dynamics of a Body Touching a Rigid Surface (Nauka, Moscow, 1992) [in Russian].
4. A. V. Karapetyan, Stability of Stationary Motions (Editorial URSS, Moscow, 1988) [in Russian].
5. V. Ph. Zhuravlev, “ the Model of Dry Friction in the Problem of the Rolling of Rigid Bodies,” Prikl. Mat. Mekh. 62(5), 762–767 (1998) [J. Appl. Math. Mech. (Engl. Transl.) 62 (5), 705–710 (1998)].