Reference

Dusan Jelic, Rastko Ajtic, Bogoljub Sterijovski, Jelka Crnobrnja-Isailovic, Suvad Lelo, Ljiljana Tomovic (2012): Distribution of the genus Vipera in the western and central Balkans (squamata: serpentes: viperidae) – Herpetozoa – 25_3_4: 109 - 132.