SANH, Do. On the motion of mechanical systems with unilateral constraints. <b>Vietnam Journal of Mechanics</b>, Hanoi, Vietnam, v. 6, n. 4, p. 26–32, 1984. DOI: 10.15625/0866-7136/10423. Disponível em: https://vjmech.vast.vn/vjmech/article/view/10423. Acesso em: 8 nov. 2025.