Template:Tchuvashov, 1975

• Tchuvashov, B.I. 1975. Permskie izvestkovye vodorosli Urala [Permian calcareous algae of the Urals]. Trudy Instituta Geologii i Geokhimii Ural'skogo Nauchnogo Tsentra Akademii Nauk SSSR 109: 3–52. [in Russian]  
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