Chukwuma-Orji, Jacinta Nkiru, et al. “A Palynology and Paleoenvironmental Study of a Section from the Amansiodo-1 Well, Anambra Basin, Southeastern Nigeria”. Geology, Geophysics and Environment, vol. 43, no. 4, Apr. 2018, p. 293, https://doi.org/10.7494/geol.2017.43.4.293.