1. Suggested methods for rock stress determination;Kim;Int. J. Rock Mech. Min. Sci. & Geomech. Abstr.,1987
2. Soil and Rock; Building Stones,1992
3. The measurement of stress in rock, Part II: borehole rock stress measuring instruments;Leeman,1965
4. Borehole deformation gauge for determining the stress in mine rock;Obert,1962
5. The doorstopper and triaxial rock stress measuring instruments developed by the CSIR;Leeman;J. S. Afr. Inst. Min. Metall.,1967