Kaneva, N. A.; Ponomarenko, E. S.; Shevchuk, S. S. (2013). The problem of genetic interpretation of problematic Calcisphaera incertae sedis (for example of Upper Devonian deposits of the Timan-Pechora region) [in Russian]. Bulletin of Institute of Geology, Komi Scientific Center, Ural Branch of the Russian Academy of Sciences. 12: 15-19.
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Kaneva, N. A.; Ponomarenko, E. S.; Shevchuk, S. S.
2013
The problem of genetic interpretation of problematic Calcisphaera incertae sedis (for example of Upper Devonian deposits of the Timan-Pechora region) [in Russian]
Bulletin of Institute of Geology, Komi Scientific Center, Ural Branch of the Russian Academy of Sciences