UGOCHUKWU, Alex Etukokwu; MINAPUYE, Isaac Odigi; GEOFFREY CHIJIOKE, Soronnadi-Ononiwu. Late Eocene to Early Miocene Biostragraphy and Palaeoenvironments in the Beta Field of the Northern-Central Niger Delta, Nigeria. American Scientific Research Journal for Engineering, Technology, and Sciences, Jordan, v. 62, n. 1, p. 145–171, 2019. Disponível em: https://www.asrjetsjournal.org/American_Scientific_Journal/article/view/4531. Acesso em: 10 sep. 2025.