Jeffrey E. Lovich, Carl H. Ernst, Steve W. Gotte, Geographic Variation in the Asiatic Turtle Chinemys reevesii (Gray) and the Status of Geoclemys grangeri Schmidt, Journal of Herpetology, Vol. 19, No. 2 (Jun., 1985), pp. 238-245
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Lovich et al. (1985) studied this question.
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