Reference

Alexandr I. Ivanov, Alexey Yu. Matov (1999): About the distribution of Glaucopsyche alexis (Poda, 1761), Everes argiades (Pallas, 1771), and the first finding of Erynnis tages (Linnaeus, 1758) in the Leningrad Region (Lepidoptera, Lycaenidae, Hesperiidae) – Atalanta – 30: 151 - 152.