Preface - vol. 20. Mongolian Journal of Chemistry, [S. l.], v. 21, n. 47, p. i, 2020. DOI: 10.5564/mjc.v21i47.1462. Disponível em: https://www.mongoliajol.info/index.php/MJC/article/view/1462. Acesso em: 18 jun. 2026.