Jan du Chêne and Adediran, 1985
From dinoflaj2
Jan du Chêne, R. and Adediran, S.A., 1985: Late Paleocene to Early Eocene dinoflagellates from Nigeria. Cahiers de micropaléontologie, Centre nationale de la recherche scientifique, no.1984-3, p.5-38, pl.1-25. (Cover date 1984, issue date 1985, according to p.2 of publication.)