Özcan, E.; Scheibner, C.; Boukhalfa, K. (2014). Orthophraminids (foraminifera) across the Paleocene-Eocene transition from north Africa: taxonomy, biostratigraphy and paleobiogeographic implications. The Journal of Foraminiferal Research. 44(3): 203-229.
Orthophraminids (foraminifera) across the Paleocene-Eocene transition from north Africa: taxonomy, biostratigraphy and paleobiogeographic implications.