Keupp, 1981
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Keupp, H., 1981: Die kalkigen Dinoflagellaten-Zysten der borealen Unter-Kreide (Unter-Hauterivium bis Unter-Albium). Calcareous dinoflagellate cysts of the Boreal Lower Creteceous (Lower Hauterivian to Lower Albian). Facies, no.5, p.1-190, pl.1-53.