Heilmann-Clausen and Van Simaeys, 2005
From dinoflaj3
Heilmann-Clausen, C. and Van Simaeys, S., 2005: Dinoflagellate cysts from the Middle Eocene to ?lowermost Oligocene succession in the Kysing Research Borehole, central Danish Basin. Palynology, v.29, p.143-204, pl.1-15.