Vikberg, V. (2004). Seasonal head dimorphism and taxonomy of some European species of Aprosthema (Hymenoptera: Symphyta: Argidae). Beitr├Ąge Zur Entomologie = Contributions to Entomology, 54(1), 107-125. https://doi.org/10.21248/contrib.entomol.54.1.107-125