Template:Ivanova, 1988
- Ivanova, R.M. 1988. Izvestkovye vodorosli vizejskogo yarusa Urala [Calcareous algae of the Visean stage of the Urals]. In: Biostratigrafiya i litologiya verkhnego paleozoya Urala [Biostratigraphy and litology of the Upper Palaeozoic of the Urals]. (Tchuvashov, B.I. Eds), pp. 4–19, 4 plates. Sverdlovsk: Ural'skoe otdelenie Akademii Nauk SSSR. [in Russian]