Cherkasova V. V., “Krivolineinyi multiplikativnyi integral v zadache o kachenii shara”, Sovremennye metody fiziko-matematicheskikh nauk (Orel), Estestvennye nauki, 1, Kartush, 2006, 131–133
V. V. Cherkasova, “Connectivities induced by the rolling of a ball on a surface”, Izv. Vyssh. Uchebn. Zaved. Mat., 2009, no. 11, 79–84; Russian Math. (Iz. VUZ), 53:11 (2009), 69–73