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Janssen, R. (1993). Taxonomy, evolution and spreading of the turrid genus Spirotropis (Gastropoda: Turridae). Scripta Geologica. Special Issue, 2: 237-261.
Janssen, R. (1993). Taxonomy, evolution and spreading of the turrid genus Spirotropis (Gastropoda: Turridae). Scripta Geologica. Special Issue, 2: 237-261.
