KUMARAN, K. N.; EDET, J.; NYONG, E. A reappraisal of salviniaceous fossils and its implication on the age and depositional environment of Nkporo Shale of Calabar Flank, Nigeria. Journal of Palaeosciences, [S. l.], v. 42, n. 1-3, p. 210–214, 1993. DOI: 10.54991/jop.1993.1148. Disponível em: https://jpsonline.co.in/index.php/jop/article/view/1148. Acesso em: 7 may. 2024.