Free Substantiation of the Effect of the Wallrocks on the State of Mine Workings Kuang Khieu Chan, Tran Tuan Minh, Xuan Nam Bui, Nguyen Quang Huy, Golik V.I. DOI: 10.24000/0409-2961-2018-4-17-24 Year: 2018 Issue num: 4 more