Foraminifera source request

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Isakova, T. N. (1986). Fusulinacean. In: Isakova, T. N.; Nazarov, B. B.: Стратиграфия и микрофауна позднего карбона - ранней перми Южного Урала - Stratigraphy and microfauna of the Late Carboniferous - Early Permian of the Southern Urals. Труды ГИН - Transactions of the Geological Institute (Academy of Sciences USSR). 402: 25-56.