Foraminifera source request

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Bykova, E. V. (1952). Фораминиферы девона Русской платформы и Приуралья - Devonian Foraminifera of the Russian Platform and Cis-Ural. Микрофауна CCCR, Microfauna of the USSR, Proceedings of the Oil Research Geological Institute (ВНИГРИ-VNIGRI). 5: 5-64.