Foraminifera source request

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Davydov, V. I. (1990). Зональное деление гжельского яруса в Донбассе и Преддонецком прогибе по фузулинидам - Zonal fusulinid subdivisions og Gzhelian in Donets Basin and Pre-Donets Through. Problems of Modern Micropaleontolgy. Transactions of Paleontological Society Session, Leningrad. 34: 52-69.