GREBERG, J.; SALAMA, A. Analysis of the Current Challenges for Deep Underground Mines: Labour Productivity Improvement. Tanzania Journal of Engineering and Technology, [S. l.], v. 39, n. 1, p. 32-46, 2020. DOI: 10.52339/tjet.v39i1.517. Disponível em: https://tjet.udsm.ac.tz/index.php/tjet/article/view/517. Acesso em: 4 may. 2024.