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Bykova, N. K. (1959). Материалы к палеоэкологии фораминифер алайского и туркестанского ярусов Ферганской долины - Materials for the paleoecology of the foraminifera of the Alai and Turkestan stages of the Fergana Valley. Proceedings of the Oil Research Geological Institute (ВНИГРИ-VNIGRI). 136(10): 544-613.