Simonov, E. 2010. Unusual colour form of Siberian pit viper (<i>Gloydius h. halys</i>) from the northern edge of its area. Acta Herpetologica. 5, 1 (Jul. 2010), 87–89. DOI:https://doi.org/10.13128/Acta_Herpetol-8536.