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APA Citation
Chen, X., Chen, Z., Mitchell, C. E., Chen, Q., & Zhang, L. (2019). a restudy of the Sandbian to Katian (Upper Ordovician) graptolites from the East Qilianshan (Chilianshan), Northwest China. Journal of paleontology, 93, 1175–1209. http://access.bl.uk/ark:/81055/vdc_100093246220.0x000047