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    3. Hystrichosphaera-spory, tsisty ili rastitelnye organizmy? In: Iskopaemye Izvestkovye Vodorosli SSSR (Fossil calcareous algae of the USSR).
                    | Maslov, V.P. | |
| 1956 | |
| Akademiya Nauk SSSR, Institut Geologicheskikh Nauk, Moscow, Trudy, no.160, p.258-264, pl.86. | |
| 3. Hystrichosphaera-spory, tsisty ili rastitelnye organizmy? In: Iskopaemye Izvestkovye Vodorosli SSSR (Fossil calcareous algae of the USSR). | 
Maslov, V.P., 1956: 3. Hystrichosphaera-spory, tsisty ili rastitelnye organizmy? In: Iskopaemye Izvestkovye Vodorosli SSSR (Fossil calcareous algae of the USSR); Akademiya Nauk SSSR, Institut Geologicheskikh Nauk, Moscow, Trudy, no.160, p.258-264, pl.86.