ZHANG Ziya, ZHANG Cong, SHI Dishi, QIN Yinglun, YU Shufang, ZHANG Zhijun, ZHOU Ruiqi. The discovery of “Three Natural Gases” in Permian Longtan Formation of Well Dianfudi 1 in the Laochang mining area, eastern Yunnan[J]. Geology in China, 2020, 47(1): 253-254(in Chinese with English abstract).