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2. Max Glenn: M.S. Thesis, Colorado School of Mines, 1971.
3. Nieki Zaveri: M.S. Thesis, Colorado School of Mines, 1970.
4. A. H. Melekaand A. V. Evershed:J. Inst. Metals, 1960, vol. 88, p. 411.
5. A. J. Kennedy:Proc. of Int. Conf. on Fatigue of Metals, p. 401, London, 1956.