MEKKI, Othman Ben; FRÉMOND, Michel. Collision of four balls aligned. <b>Vietnam Journal of Mechanics</b>, Hanoi, Vietnam, v. 32, n. 3, p. 145–156, 2010. DOI: 10.15625/0866-7136/32/3/302. Disponível em: https://vjmech.vast.vn/vjmech/article/view/302. Acesso em: 8 nov. 2025.