The Mine Working's Roof Stress-strain State Research in the Perspective of Development of New Coal Deposits of KuzbassSvetlana Kostyuk, Nikolay Bedarev, Oleg Lyubimov and Arthur ShaikhislamovE3S Web Conf., 21 (2017) 01002DOI: https://doi.org/10.1051/e3sconf/20172101002