7Wang Zhirong, Chen Lingxia , Cheng Congren, et al.. Forecast of gas geological hazards for "Three - Soft" coal seams in gliding structural area. Journal of China University of Mining and Technology, 2007, 17(4) : 484 -488.
8Guo Deyong, Song Guangtai, Ku Mingxin. Research on coal structure indices to coal and gas outbursts in Pingdingshan Mine Area, China. Journal of Coal Science and Engineering( China), 2002, 8(1):1 -6.
9Guo Deyong, Hart Dexin, Jiang Guangjie. Research on geological structure mark of coal and gas outbursts in Pingdingshan mining area. Journal of China University of Mining and Technology, 2002, 12(1) : 72 -76.