1. Cristescu, N., Dynamic plasticity, North-Holland Publishing Company, Amsterdam, 1967, 511.
2. Lundberg, B., Some basic problems in percussive rock destruction, dissertation, Chalmers University of Technology, Gothenburg, 1971, 59.
3. Lundberg, B., Int. J. Rock Mech. Min. Sci. & Geomech. Abstr. 10 (1973) 381.
4. Kolsky, H., Stress waves in solids, Dover Publications, Inc., New York, 1963, 106.