KUMAR, S.; SINHA, R. K.; JAWED, M. A Global Overview of the Schemes of Extraction of Pillars in Major Coal Producing Countries. Journal of Mines, Metals and Fuels, [S. l.], v. 70, n. 10, p. 528–536, 2023. DOI: 10.18311/jmmf/2022/32292. Disponível em: https://informaticsjournals.com/index.php/jmmf/article/view/32292. Acesso em: 19 may. 2024.