Foraminifera source request

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Zhou, T. M.; Sheng, J. Z.; Wang, Y. J. (1987). 云南广南小独山石炭-二叠系界线地层及(竹蜓)类分带 - Carboniferous-Permian boundary beds and fusulinid zones at Xiaodushan, Guangnan, eastern Yunnan. 微体古生物学报 - Acta Micropalaeontologica Sinica. 4(2): 123-160.