Reference

Malgorzata Strzelec, Wlodzimierz Serafinski (1996-1997): Population ecology of Potam opyrgus antipodarum (Gray, 1843) in an recently colonized area: Upper Silesia (Southern Poland) (Gastropoda: Prosobranchia: Hydrobiidae) – Malakologische Abhandlungen – 18: 75 - 82.