NEMEJC, F. Psygmophyllopsida, one of the fundamental pteridophytic divisions (Phyla). Journal of Palaeosciences, [S. l.], v. 9, n. (1-2), p. 21–25, 1960. DOI: 10.54991/jop.1960.593. Disponível em: https://jpsonline.co.in/index.php/jop/article/view/593. Acesso em: 24 jul. 2024.