Fryda, Ferrova & Frydova 2013. Review of palaeozygopleurid gastropods (Palaeozygopleuridae, Gastropoda) from Devonian strata of the Perunica microplate (Bohemia), with a re-evaluation of their stratigraphic distribution, notes on their ontogeny, and descriptions of new taxa. Zootaxa, 3669(4), Jun 10 2013: 469-489