Keupp, 1990
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Keupp, H., 1990: Eine neue pithonelloide Dinoflagellaten-Kalkzyste aus der Oberkreide von South Dakota/U.S.A. A new pithonellid calcareous dinoflagellate cyst from the Upper Cretaceous of South Dakota/U.S.A. Facies, v.22, p.47-58, pl.14-15.