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Stefania Bucci-Innocenti, Matilde Ragghianti, Giorgio Mancino, Investigations of Karyology and Hybrids in Triturus boscai and T. vittatus, with a Reinterpretation of the Species Groups within Triturus (Caudata: Salamandridae), Copeia, Vol. 1983, No. 3 (Aug. 16, 1983), pp. 662-672
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Bucci-Innocenti et al. (1983) studied this question.
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