Cai Zhiguo and Zheng Guoguang, 1998
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Cai Zhiguo, Zheng Guoguang, Cui Zhantang et al., 1998: Tertiary stratigraphy and micropalaeontology of the Central Hebei petroliferous area. 550 p., 143 pl.; Science Press, Beijing, China. (Authorship is as given in original.)
