Reference

Angel Dyugmedzhiev, Kostadin Andonov, Georgi Popgeorgiev, Borislav Naumov, Yurii V. Kornilev (2020): Crepuscular and nocturnal activity of the Nose-horned viper, Vipera ammodytes (Linnaeus, 1758) is more common than previously reported – Herpetozoa – 33: 165 - 169.