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2. N.M. Fairweather, An investigation of the driving mechanism of the vibrohammer, Ph.D. Thesis, University of Aberdeen, 1984.
3. R.G. Stevenson, An investigation into the use of vibro-impact techniques in the design of a ground moling system, Ph.D. Thesis, University of Aberdeen, 1992.
4. Computer-based model of vibro-impact driving;Lok,1999
5. Experimental and numerical study of a new resonance hammer drilling model with drift;Franca;Chaos Solitons Fractals,2004