Foraminifera source request

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Sheng, J. C. (1958). 内蒙白云鄂博附近上石炭纪的蜒科 - Some upper carboniferous fusulinids from the vicinity of Beiyin Obo, Inner Mongolia. 古生物学报 - Acta Palaeontologica Sinica. 6(1): 37-52.