2 literature references for Protracheoniscus brunneus (Brandt, 1833):

Author: Schotte, M., B.F. Kensley, and S. Shilling.
Year: 1995
Title: nwards). World list of Marine, Freshwater and Terrestrial Crustacea Isopoda. National Museum of Natural History Smithsonian Institution: Washington D.C., USA.
Author: Brandt, J. F.
Year: 1833
Title: Conspectus monographiae crustaceorum oniscodorum Latreillii. Bulletin de la Societe Imperiale des Naturalistes de Moscou 4:171-193.