Frýda, Jiří (1997). "Oldest Representatives of the Superfamily Cirroidea (Vetigastropoda) with Notes on Early Phylogeny". Journal of Paleontology. 71 (5): 839–847. doi:10.1017/s0022336000035782. JSTOR1306561. S2CID130637321.
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Frýda, Jiří (1997). "Oldest Representatives of the Superfamily Cirroidea (Vetigastropoda) with Notes on Early Phylogeny". Journal of Paleontology. 71 (5): 839–847. doi:10.1017/s0022336000035782. JSTOR1306561. S2CID130637321.
Frýda, Jiří (1997). "Oldest Representatives of the Superfamily Cirroidea (Vetigastropoda) with Notes on Early Phylogeny". Journal of Paleontology. 71 (5): 839–847. doi:10.1017/s0022336000035782. JSTOR1306561. S2CID130637321.