Authors(s)	Janssen, A. W.
Year	1989b
Title	Some new pteropod species from the North Sea Basin Cainozoic (Mollusca: Gastropoda, Euthecosomata). Mededel. Werkgr. Tertiair. Kwart. Geol. 26(3): 91-133, 5 figs, 8 pls.