Heilmann-Clausen, C. and Thomsen, E.,
1995
Barremian-Aptian dinoflagellates and calcareous nannofossils in the Ahlum 1 Borehole and the Otto Gott Clay pit, Sarstedt, Lower Saxony Basin, Germany.
Geologisches Jahrbuch, Reihe A, v.141, p.257-365, pl.1-20.