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4. Ansell, A., 1999. Dynamisk provning av energiupptagande, ingjuten bergbult i Kirunagruvan, (Dynamic testing of energy absorbing, fully grouted rock bolts in the Kiirunavaara mine. In Swedish), Technical report 1999:7, Department of Structural Engineering, Royal Institute of Technology, Stockholm, p. 16
5. Ansell, A., 2000. Testing and modelling of an energy absorbing rock bolt, in: Structures under Shock and Impact VI, pp. 417–426