KRASSILOV, V. A.; DOLUDENKO, M. P. New Jurassic protocycadalean ovuliphores and the origins of the Cycadales. Journal of Palaeosciences, [S. l.], v. 53, n. (1-3), p. 83–89, 2004. DOI: 10.54991/jop.2004.211. Disponível em: https://www.jpsonline.co.in/index.php/jop/article/view/211. Acesso em: 3 may. 2024.