Damassa, Sarah Pierce (1997): Dinoflagellate cysts without walls; Evittosphaerula paratabulata Manum, 1979 and Chaenosphaerula magnifica gen. et sp. nov. from Deep Sea Drilling Project Site 338, Norwegian Sea. Elsevier, Amsterdam, Netherlands, In: Wicander, R. (editor), Srivastava, S. K. (editor), Festschrift for Helen Tappan and Alfred R. Loeblich Jr., 98 (1-2), 159-176, georefid:1998-021012