1. Shaft Construction Branch China Coal Research Institute Beijing China
2. Tian Di Science & Technology Co. Ltd Beijing China
3. Beijing China Coal Mine Engineering Co. Ltd Beijing China
4. Permafrost Laboratory, Department of Geography University of Sussex Brighton UK
5. University of Science and Technology Beijing Beijing China
6. North China Institute of Science and Technology Beijing China
7. School of Civil Engineering Shijiazhuang Tiedao University Hebei China