1. A preliminary theory of static penetration by a rigid wedge into a brittle material;Paul;Trans. Soc. Min. Engrs.,1965
2. A note on the penetration of a rigid wedge into a nonisotropic brittle material;Benjumea;Int. J. Rock Mech. Min. Sci.,1969
3. On the penetration of rock by three-dimensional indentors;Miller;Int. J. Rock Mech. Min. Sci.,1968
4. Spraeckning i berg—en elementaer modell;Lundberg;Tryckluft,1967
5. Some basic problems in percussive rock destruction;Lundberg,1971