Properties of humic substances isolated from different natural sources. Mongolian Journal of Chemistry, [S. l.], v. 14, p. 51–56, 2014. DOI: 10.5564/mjc.v14i0.199. Disponível em: https://www.mongoliajol.info/index.php/MJC/article/view/199. Acesso em: 19 jun. 2026.