Reseach Old Rubber Tires Utilization to Increase the Life of Support in the Longwall at Quang Ninh VietnamPhi Hung Nguyen, Cao Khai Nguyen, Duc Thang Pham and Van Kien TaE3S Web Conf., 134 (2019) 01010DOI: https://doi.org/10.1051/e3sconf/201913401010