SAIKIA, B.K. Spectroscopic Studies of Minerals in Some Indian Coals. Asian Journal of Chemistry, [S. l.], v. 23, n. 4, p. 1887–1888, 2010. Disponível em: https://asianpubs.org/index.php/ajchem/article/view/10168. Acesso em: 13 apr. 2025.