PHUC, N. T. Planetary cycloid roller gear reducer. Vietnam Journal of Mechanics, Hanoi, Vietnam, v. 24, n. 2, p. 115–122, 2002. DOI: 10.15625/0866-7136/24/2/6613. Disponível em: https://vjs.ac.vn/index.php/vjmech/article/view/6613. Acesso em: 22 may. 2022.