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♦ 1Geographic variation in the diet composition of a secretive Mediterranean colubrid snake: Coronella girondica from Spain and Italy, Luca Luiselli, Juan M. Pleguezuelos, Massimo Capula, Carmen Villafranca, Ital. J. Zool., 68: 57-60 (2001)
♦ 2Correlates between morphology, diet and foraging mode in the Ladder Snake Rhinechis scalaris (Schinz, 1822), Juan M. Pleguezuelos , Juan R. Fernández-Cardenete , Santiago Honrubia , Mónica Feriche , Carmen Villafranca, Contributions to Zoology, 76 (3) 2007