Qian Lijun et al., 1987
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Qian Lijun, Bai Qingzhao, Xiong Cunwei, Wu Jingyun, He Dechang, Zhang Xinmin and Xu Maoyu, 1987: Jurassic coal-bearing strata and the characteristics of coal accumulation from northern Shaanxi. Northwest University Press, 202p. [In Chinese]