David L. Swanson, Brent M. Graves, Supercooling and Freeze Intolerance in Overwintering Juvenile Spadefoot Toads (Scaphiopus bombifrons), Journal of Herpetology, Vol. 29, No. 2 (Jun., 1995), pp. 280-285
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Swanson et al. (1995) studied this question.