GUPTAI, V. J.; HONGFU, Yin. Otoceras and the Permian-Triassic Boundary. Journal of Geological Society of India, [S. l.], v. 30, n. 2, p. 132–142, 1987. Disponível em: https://geosocindia.com/index.php/jgsi/article/view/66085. Acesso em: 5 oct. 2024.