Foraminifera source request

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Bykova, E. V. (1956). Фораминиферы ордовика и силура Советской Прибалтики - Foraminifera of the Ordovician and Silurian of the Soviet PreBaltic. Микрофауна СССР - Mikrofauna SSSR, Trudy Vsesoyuznogo Nauchno-Issledovatel'skogo Geologorazvedochnogo Instituta VNIGRI. 8(98): 6-27.