Foraminifera source request

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Zhou, J. -p. (1998). 桂西北早、中二叠世常么期和栖霞期蜓类动物群 - The Changmean-Chihsian (permian) fusulinids from Northwestern Guangxi, South China. Acta Palaeontologica Sinica. 37(4): 467-476.