KRASSILOV, V. A.; AFONIN, S. A.; NAUGOLNYKH, S. V. Permotheca with in situ pollen grains from the Lower Permian of the Urals. Journal of Palaeosciences, [S. l.], v. 48, n. (1-3), p. 19–25, 1999. DOI: 10.54991/jop.1999.1287. Disponível em: https://jpsonline.co.in/index.php/jop/article/view/1287. Acesso em: 5 may. 2024.