1. Department of Geography and Geology Eastern Michigan University Ypsilanti MI USA
2. Department of Geosciences Virginia Tech Blacksburg VA USA
3. Trofimuk Institute of Petroleum Geology and Geophysics Siberian Branch Russian Academy of Sciences Novosibirsk Russia
4. Department of Economics and Management Guiyang University Guiyang Guizhou China
5. College of Resource and Environment Engineering Guizhou University Guiyang Guizhou China