GAO, Xin; WU, Zhifeng. Research on Differential Competition of Coal Mine Drilling Rig Design and Manufacturing Enterprises. Scientific Journal of Economics and Management Research, [S. l.], v. 7, n. 5, p. 84–89, 2025. DOI: 10.54691/k57t7175. Disponível em: https://bcpublication.org/index.php/SJEMR/article/view/8641. Acesso em: 15 sep. 2026.