Graf, W., Waringer, J. and Pauls, S.U. 2009. A new feeding group within larval Drusinae (Trichoptera: Limnephilidae): the Drusus alpinus Group sensu Schmid, 1956, including larval descriptions of Drusus franzi Schmid, 1956, and Drusus alpinus (Meyer-Dür, 1875). Zootaxa. 2031, 1 (Mar. 2009), 53–62. DOI:https://doi.org/10.11646/zootaxa.2031.1.4.