VASILEVA, N.; LILOV, L. Steady-state motions for systems of rigid bodies connected with strings. Ann. Sofia Univ. Fac. Math. and Inf., [S. l.], v. 84, p. 139–157, 1993. Disponível em: https://stipendii.uni-sofia.bg/index.php/fmi/article/view/476. Acesso em: 5 dec. 2024.