Frýda, J., Ferrová, L., & Frýdová, B. (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), 469–489. https://doi.org/10.11646/zootaxa.3669.4.3