Keupp, 1987
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Keupp, H., 1987: Die kalkigen Dinoflagellatenzysten des Mittelalb bis Untercenoman von Escalles/Boulonnais (N-Frankreich). Dinoflagellate cysts from the Middle Albian to Early Cenomanian of Escalles/Boulonnais (northern France). Facies, no.16, p.37-88, pl.6-21.