Keupp, 1980a
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Keupp, H., 1980a: Calcigonellum Deflandre 1948 und Echinodinella n. gen. (kalkige Dinoflagellaten-Zysten) aus der nordwestdeutschen Unter-Kreide. Calcigonellum Deflandre 1948 and Echinodinella n. gen. (calcareous dinoflagellate cysts) from the Lower Cretaceous of northwest Germany. Facies, no.2, p.123-148, pl.14-17.