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Manganelli, G.; Giusti, F. (2000). Drepanostoma helenae, a new helicodontine land snail from the Lower Pliocene of Balze di Caspreno near Siena (central Italy) and a discussion on the status of Protodrepanostoma Germain, 1929 (Gastropoda, Pulmonata: Hygromiidae). Bollettino della Società Paleontologica Italiana. 39(3): 351-358.
Manganelli, G.; Giusti, F. (2000). Drepanostoma helenae, a new helicodontine land snail from the Lower Pliocene of Balze di Caspreno near Siena (central Italy) and a discussion on the status of Protodrepanostoma Germain, 1929 (Gastropoda, Pulmonata: Hygromiidae). Bollettino della Società Paleontologica Italiana. 39(3): 351-358.
