ORDOVICIAN PALAEOKARST LANDFORM IN ORDOS BASIN AND GAS ENRICHMENT CHARACTERISTICS
Xia Riyuan, Tang Jiansheng, Guan Bizhu, Luo Weiquan, Ma Zhenfang, Zhou Shuxun, Yu Zhongping, Pan Linghong
Oil & Gas Geology . 1999, (2): 133 -136 .  DOI: 10.11743/ogg19990208