2 literature references for Trichoniscus pusillus Weber, 1880:

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: Weber, M.
Year: 1880
Title: Ueber einige neue Isopoden der niederlandischen Fauna. Tijdschrift der Nederlandse Dierkundige Vereniging 5:167-195.