1. Strain wave behavior in the percussive drilling process;Furby;Trans. Instn Min. Metall.,1964
2. Hustrulid W.A. Unpublished Research, Atlas Copco AB, Stockholm, Sweden (1965–1966).
3. Strain wave behavior in percussive drill steels during drilling operations;Hawkes;Mine Quarry Engng,1961
4. Strain wave behavior in percussive drill steels during drilling operations;Hawkes;Mine Quarry Engng,1961