Reese, S. A., Stewart, R. E., Crocker, C. E., Jackson, D. C., & Ultsch, G. R. (2004). Geographic variation of the physiological response to overwintering in the painted turtle (chrysemys picta). Physiological and Biochemical Zoology, 77(4), 619–630. |
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Ultsch, G. R., Ward, M. G., LeBerte, C. M., Kuhajda, B. R., & Stewart, R. E. (2001). Intergradation and origins of subspecies of the turtle chrysemys picta: morphological comparisons. Canadian Journal of Zoology, 79(3), 485–498. |
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