Foraminifera source request

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Chen, S. (1956). 中国南部的蜓科II-中国二叠纪茅口灰岩的蜓科动物群 - Fusulinidae of South China. Part II. Fusulinid fauna of the Permian Maokou Limestone in China. Palaeontologica Sinica, whole number 140, new series B. 6: 1-71.