Beckmann 2002. [Elements of the revision of the endemic Rupestrella of Sicily.] Falkner, Margrit; Groh, Klaus; Speight, Martin C.D.[Eds]. [Malacological contributions. Volume honoring Gerhard Falkner.], ConchBooks, Hackenheim, 2002: i-x, 1-547. Chapter pagination: 49-78