Hildebrand-Habel and Willems, 1997
From dinoflaj2
Hildebrand-Habel, T. and Willems, H., 1997: Calcareous dinoflagellate cysts from the Middle Coniacian to Upper Santonian chalk facies of Lägerdorf (n Germany). Cour. Forsch.-Inst. Senckenberg, v.201, p.177-199, pl.1-3.
