BHATTACHARYA, J. Underground communication is keeping pace with surface communication. Journal of Mines, Metals and Fuels, [S. l.], v. 69, n. 5, p. 139–139, 2021. DOI: 10.18311/jmmf/2021/28071. Disponível em: https://informaticsjournals.com/index.php/jmmf/article/view/28071. Acesso em: 29 mar. 2024.