1. Preliminary theory of static penetration by a rigid wedge into a brittle material;Paul;Trans. AIME,1965
2. Shear failure of anisotropic rocks;Jaeger;Geol. Mag.,1960
3. Elasticity, Fracture and Flow;Jaeger,1962
4. Experiments on Wedge Indentation in Rocks;Sikarskie,1966
5. Fracture criterion for brittle anisotropic rock;Walsh;J. geophys. Res.,1964