SANH, D. The problem of first integral of nonholonomic systems. Vietnam Journal of Mechanics, Hanoi, Vietnam, v. 23, n. 1, p. 51–64, 2001. DOI: 10.15625/0866-7136/9940. Disponível em: https://vjs.ac.vn/index.php/vjmech/article/view/9940. Acesso em: 5 may. 2024.