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- [2] Simulation research on the influence of eroded primary key strata on dynamic strata pressure of shallow coal seams in gully terrain[J]. Zhang Zhiqiang a,b,c, , Xu Jialin a,b , Zhu Weibing a,b , Shan Zhenjun a,ba State Key Laboratory of Coal Resources and Mine Safety, Xuzhou 221008, China b School of Mines, China University of Mining & Technology, Xuzhou 221116, China c School of Geology & Exploration Engineering, Xinjiang University, Urumqi 830046, China.International Journal of Mining Science a