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Olivier Rieppel, Studies on Skeleton Formation in Reptiles. Patterns of Ossification in the Skeleton of Lacerta agilis exigua Eichwald (Reptilia, Squamata), Journal of Herpetology, Vol. 28, No. 2 (Jun., 1994), pp. 145-153
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Olivier C. Rieppel (1994) studied this question.
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