Wielstra, B.; Litvinchuk, S. N.; Naumov, B.; Tzankov, N.; Arntzen, J. W. A Revised Taxonomy of Crested Newts in the Triturus karelinii Group (Amphibia: Caudata: Salamandridae), With the Description of a New Species. Zootaxa 2013, 3682, 441–453.