Janssen, A. W. (1985). Evidence for the occurrence of a "skinny" or "minute stage" in the ontogenetical development of Miocene Vaginella (Gastropoda, Euthecosomata) from the North Sea and Aquitaine basins. Mededelingen van de Werkgroep voor Tertiaire en Kwataire Geologie. 21: 193-204.
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Janssen, A. W.
1985
Evidence for the occurrence of a "skinny" or "minute stage" in the ontogenetical development of Miocene <i>Vaginella</i> (Gastropoda, Euthecosomata) from the North Sea and Aquitaine basins
Mededelingen van de Werkgroep voor Tertiaire en Kwataire Geologie