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2. 8) J. M. SAWHILL, Jr and J. C. BAKER : Weld ing Research Supplement (1980), Jan., 19-S
3. 12) J. HEUSCHKEL : Welding J., 25 (1946), p. 700S
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5. 17) B. POLLARD and R. M. GOODENOW : SAE Paper 790006 (1979)