Hernández-Roldán, J. L.; Munguira, M. L.; Wagner, W.; Vila, R. Comparative Analysis and Taxonomic Use of the Morphology of Immature Stages and Natural History Traits in European Species of Pyrgus Hübner (Lepidoptera: Hesperiidae, Pyrginae). Zootaxa 2012, 3470, 1–71.