| Affiliation: | School of Mathematics and Science, Shijiazhuang University of Economics, Shijiazhuang 050031, Hebei, P. R. China/State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan, P. R. China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan, P. R. China/College of Resources, Shijiazhuang University of Economics, Shijiazhuang 050031, Hebei, P. R. China |
