Depositional system of the Middle Permian Q ixia Formation in the western Sichuan Basin
WeiGuoqi,YangWei，Zhu Yonggang，Jin Hui，LiYuegang,Shi Zhensheng and Shen Yuhong
Oil & Gas Geology . 2010, (4): 442 -448 .  DOI: 10.11743/ogg20100407