SANH, Do. The problem of first integral of nonholonomic systems. <b>Vietnam Journal of Mechanics</b>, Hanoi, Vietnam, v. 23, n. 1, p. 51–64, 2001. DOI: 10.15625/0866-7136/9940. Disponível em: https://vjmech.vast.vn/vjmech/article/view/9940. Acesso em: 9 nov. 2025.