Janssen, A. W.; Kroh, A. & Ávila, S. P. (2008). Early Pliocene heteropods and pteropods (Mollusca, Gastropoda) from Santa Maria Island (Azores, Portugal): systematics and biostratigraphic implications. Acta Geologica Polonica. 58: 355-369.
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Janssen, A. W.; Kroh, A. & Ávila, S. P.
2008
Early Pliocene heteropods and pteropods (Mollusca, Gastropoda) from Santa Maria Island (Azores, Portugal): systematics and biostratigraphic implications