VELEV, S.; KALCHEVSKA, K. Construction Features of Drilling Tools and Machines in Mining. Proceedings of the Bulgarian Academy of Sciences, Sofia, Bulgaria, v. 79, n. 1, p. 83–87, 2026. DOI: 10.7546/CRABS.2026.01.10. Disponível em: https://www.proceedings.bas.bg/index.php/cr/article/view/914. Acesso em: 10 oct. 2026.