Foraminifera source request

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Chuvashov, B. I.; Leven, E. Y.; Davydov, V. I. (1986). Пограничные отложения карбона и перми Урала, Прюралья и Средней Азии: биостратиграфия и корреляция - Boundary deposits of the Carboniferous and Permian from the Urals, Preuralia and Middle Asia: biostratigraphy and correlation. Akad. Nauk SSSR, Uralskii Nauchnyi Tsentr, Institut Geologii i Geokimii. 1-151 (In Russian).