Template:Gnilovskaja, 1972
- Gnilovskaja, M.B. 1972. Izvestkovyye vodorosli srednego i pozdnego ordovika vostochno Kazakhstana [Calcareous algae of the Middle and the Late Ordovician of Eastern Kazakhstan]. pp. 196, 58 figures, 15 plates. Leningrad: Izdatel'stvo "Nauka". [in Russian with English abstract]