Stratigraphic recognition and correlation of Middle Ordovician Yijianfang Formation in northwestern Tazhong uplift and its geological significances
Zhang Heng, Cai Zhongxian, Qi Lixin, Yun Lu, Tang Peng, He Junyi
Acta Petrolei Sinica . 2017, (6): 622 -635 .  DOI: 10.7623/syxb201706002

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