Permian. Danmarks Geologiske Undersøgelse Serie B, [S. l.], v. 8, p. 28–32, 1982. DOI: 10.34194/serieb.v8.7065. Disponível em: https://geusjournals.org/index.php/serieb/article/view/7065. Acesso em: 20 oct. 2025.