Freitas, I., Ursenbacher, S., Mebert, K., Zinenko, O., Schweiger, S., Wüster, W., Brito, J. C., Crnobrnja-Isailović, J., Halpern, B., Fahd, S., Santos, X., Pleguezuelos, J. M., Joger, U., Orlov, N., Mizsei, E., Lourdais, O., Zuffi, M. A., Strugariu, A., Zamfirescu, Ş. R., Martínez-Solano, Í., Velo-Antón, G., Kaliontzopoulou, A., & Martínez-Freiría, F. Evaluating taxonomic inflation: towards evidence-based species delimitation in Eurasian vipers (Serpentes: Viperinae) : [angl.] // Amphibia-Reptilia. — 2020. — T. 41, № 3. — P. 285—311. — doi:10.1163/15685381-bja10007.
Speybroeck J., Beukema W., Bok B., Van Der Voort J., Velikov I. Field Guide to the Amphibians and Reptiles of Britain and Europe : [angl.]. — Bloomsbury Natural History, 2016. — P. 404. — 432 p. — ISBN 1408154595.
Freitas, I., Ursenbacher, S., Mebert, K., Zinenko, O., Schweiger, S., Wüster, W., Brito, J. C., Crnobrnja-Isailović, J., Halpern, B., Fahd, S., Santos, X., Pleguezuelos, J. M., Joger, U., Orlov, N., Mizsei, E., Lourdais, O., Zuffi, M. A., Strugariu, A., Zamfirescu, Ş. R., Martínez-Solano, Í., Velo-Antón, G., Kaliontzopoulou, A., & Martínez-Freiría, F. Evaluating taxonomic inflation: towards evidence-based species delimitation in Eurasian vipers (Serpentes: Viperinae) : [angl.] // Amphibia-Reptilia. — 2020. — T. 41, № 3. — P. 285—311. — doi:10.1163/15685381-bja10007.