Juan Sebasti#xE1;n Arteaga. “Zoning for the Risk of Methane Gas Explosions in Coal Mining in Boyac#xE1; (Colombia)”. Global Journals of Research in Engineering 22, no. J1 (February 1, 2022): 23–29. Accessed May 3, 2024. https://engineeringresearch.org/index.php/GJRE/article/view/101202.