Instability factors and control technology for roadway with extra-thick mudstone roof
MA Zhenqian, LIU Yong, LIU Qinzhi, HAN Sen, CHEN Chuan
China Safety Science Journal . 2018, (5): 147 -152 .  DOI: 10.16265/j.cnki.issn1003-3033.2018.05.025