Tiwari, M., & Bjorndal, K. A. (?????.).  (2000).  Variation in morphology and reproduction in loggerheads, Caretta caretta, nesting in the United States, Brazil, and Greece. HerpetologicaHerpetologica, 56, 343-356. ????????????? ??? 2000///.

Hailey, A., & Willemsen, R. E. (?????.).  (2000).  Population density and adult sex ratio of the tortoise Testudo hermanni in Greece: Evidence for intrinsic population regulation. Journal of ZoologyJournal of Zoology, 251, 325-338. ????????????? ??? 2000///.