Girardi 2009. [Contribution to the knowledge on the genus Bythiospeum Bourguignat, 1882, in southern France (1): Bythiospeum diaphanum regalonense, Bythiospeum diaphanum luberonense, Bythiospeum diaphanum meyrarguense, Bythiospeum diaphanum alpillense, new subspecies (Mollusca: Caenogastropoda: Hydrobiidae: Belgrandiinae).] Documents Malacologiques Hors Serie, 3, avril 2009: 153-162