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Clerx, J.P.M. & Gittenberger, E. (1977). Einiges über Cernuella (Pulmonata, Helicidae). Zoologische Mededelingen. 52(4): 27-56, pls 1-2.
Clerx, J.P.M. & Gittenberger, E. (1977). Einiges über Cernuella (Pulmonata, Helicidae). Zoologische Mededelingen. 52(4): 27-56, pls 1-2.