Template:Verity,R, 1919
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- Verity, R. 1919. Seasonal Polymorphism and Races of some European Grypocera and Rhopalocera. The Entomologist's Record and Journal of Variation 31: 26-31, 43–48, 121-129, 178-184, 193-201; 32: 3-8, 140-152.