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Manganelli, G., Oliverio, M., Sparacio, I. & Giusti, F. (2001). Morphological and molecular analysis of the status and relationships of the land snail "Cernuella" usticensis (Calcara, 1842) (Stylommatophora: Helicoidea). Journal of Molluscan Studies, 67: 447-462. London.
Manganelli, G., Oliverio, M., Sparacio, I. & Giusti, F. (2001). Morphological and molecular analysis of the status and relationships of the land snail "Cernuella" usticensis (Calcara, 1842) (Stylommatophora: Helicoidea). Journal of Molluscan Studies, 67: 447-462. London.
