Väisänen, Rauno, Kari Heliövaara, and Päivö Somerma. 1994. “Wing Variation of Maculinea Arion (Linnaeus) in Finland (Lepidoptera, Lycaenidae)”. Entomologica Fennica 5 (3):139-46. https://doi.org/10.33338/ef.83809.