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2. Yieldable rock bolts for shock loading and grouted bolts for faster rock stabilization;Ortlepp;Mines Magazine, Colorado School of Mines,1970
3. Considerations in the design of support for deep hard rock tunnels;Ortlepp,1983
4. Yieldable roof support for mines;Herbst,1990
5. Evaluation of current support practices in burst-prone ground and preliminary guidelines for Canadian hard rock mines;McCreath,1922