DENEVA, S. Particular movements of rolling sphere on absolutely rough tore. Ann. Sofia Univ. Fac. Math. and Inf., [S. l.], v. 85, p. 131–141, 1993. Disponível em: https://ftl5.uni-sofia.bg/index.php/fmi/article/view/461. Acesso em: 5 dec. 2024.