Royce E. Ballinger, Dale L. Droge, Steven M. Jones, Reproduction in a Nebraska Sandhills Population of the Northern Prairie Lizard Sceloporus undulatus garmani, The American Midland Naturalist, Vol. 106, No. 1 (Jul., 1981), pp. 157-164
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Ballinger et al. (1981) studied this question.
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