A.  Wiktor, ?The slugs of Bulgaria (Arionidae, Milacidae, Limacidae, Agriolimacidae - Gastropoda, Stylommatophora)?, Annales Zoologici, vol. 37, pp. 71-205, 1983.

A.  Wiktor, Fauna Graeciae VIII: The slugs of Greece (Arionidae, Milacidae, Limacidae, Agriolimacidae - Gastropoda, Stylommatophora). Irakleio: Natural History Museum of Crete, University of Crete, 2001.