NGUYỄN DANH SƠN. Determination of exploitable efficiency and working conditions of digging machine. Journal of Technical Education Science, [S. l.], v. 10, n. 2, p. 69–74, 2015. Disponível em: https://www.jte.edu.vn/index.php/jte/article/view/539. Acesso em: 7 apr. 2026.