John K. Tucker, Nirvana I. Filoramo, Gary L. Paukstis, Fredric J. Janzen, Response of Red-Eared Slider, Trachemys scripta elegans, Eggs to Slightly Differing Water Potentials, Journal of Herpetology, Vol. 32, No. 1 (Mar., 1998), pp. 124-128
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Tucker et al. (1998) studied this question.