Graf, W., Waringer, J. & 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), 53–62.