Graf, W.; Waringer, J.; Pauls, S. U. 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 2009, 2031, 53–62.