Stover and Hardenbol, 1994
From dinoflaj3
Stover, L.E. and Hardenbol, J., 1994: Dinoflagellates and depositional sequences in the Lower Oligocene (Rupelian) Boom Clay Formation, Belgium. Bulletin de la Société belge de géologie, v.102, no.1-2, p.5-77, pl.1-13. (Cover date 1993, issue date 1994.)