Ana I. Puente, Kepa Altonaga, Carlos E. Prieto, Ana Rallo, Delimitation of Biogeographical Areas in the Iberian Peninsula on the Basis of Helicoidea Species (Pulmonata: Stylommatophora), Global Ecology and Biogeography Letters, Vol. 7, No. 2 (Mar., 1998), pp. 97-113
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Puente et al. (1998) studied this question.
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