Foraminifera source request

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Kulagina, E.; Rumyantseva, Z. S.; Pazukhin, V. N.; Kochetova, N. N. (1992). Граница нижнего среднего карбона на Южном Урале и Среднем Тянь-Шане - Lower/Middle Carboniferous boundary in the South Urals and Central Tien Shan. Moscow, Nauka Publishing House. 1-110.