Reference

Ulrich Joger, Alenxandre Teynié, Dieter Fuchs (1988): Morphological characterization of Vipern wagneri Nilson & Andrén, 1984 (Reptilia: Viperidae), with first description of the males – Bonn zoological Bulletin - früher Bonner Zoologische Beiträge. – 39: 221 - 228.