NATURAL BITUMEN OF GEORGIAN. World Science, [S. l.], v. 1, n. 2(54), p. 15–19, 2020. DOI: 10.31435/rsglobal_ws/28022020/6924. Disponível em: https://rspublisher.org/index.php/ws/article/view/48. Acesso em: 17 mar. 2026.