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4. S. S. Glickstein, E. Friedman, and W. Yensicavich:Welding Journal, 1975, vol. 54, p. 113s.
5. S. Kou: in “Modeling of Casting and Welding Processes”, H. D. Brody and D. Apelian, eds., TMS-AIME, Warrendale, PA, 1981, p. 129.