Foraminifera source request

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Bogdanovich, A. K. (1969). Tschokrakella-novyy rod foraminifer iz srednego Miotsena Kavkaza [Tschokrakella-a new genus of foraminifer from the middle Miocene of the Caucasus]. Trudy Vsesoyuznogo Neftyanogo Nauchno-Issledovatel'skogo Instituta (VNII) Krasnodar Filial. 19: 114-120.