Foraminifera source request

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Chen Gengbao; Yang Chenfan; Wang Xiangtong; Zhang Linxin. (1991). 云南石炭系顶界的研究及其类化石 - On the boundary between Carboniferous and Permian and the fusulinids of the the boundary stratigraphy in Yunnan. 云南科学技术出版社 - Kunming: Yunnan Science and Technology Press. 1-136.