A. AL-HASSON AND YASSER H. KADDO, M.; D. NADER, A. A Detail Study of the Genus Vallatisporites as a Lower Carboniferous Stratigraphic and Paleogeographic Indicator. Iraqi National Journal of Earth Science (INJES), [S. l.], v. 7, n. 2, p. 73–96, 2007. DOI: 10.33899/earth.2007.39273. Disponível em: https://ojs.uomosul.edu.iq/index.php/injes/article/view/40696. Acesso em: 5 sep. 2025.