ET AL., X. S. Problems in the Classification of Mine Gas Grades and Classification of Coal and Gas Outburst Mine Types. CONVERTER, [S. l.], p. 426 - 431, 2021. DOI: 10.17762/converter.194. Disponível em: https://converter-magazine.info/index.php/converter/article/view/194. Acesso em: 25 apr. 2024.