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2. 12) G. W. BUSB, L. W. AUSTIN and J. T. WELSB : Iron and Steel Engineer (1979) Dec., p. 48
3. 15) W. C. SIEVERT and L. L. ERANKS : SAE Technical Paper Series 800146
4. 16) J. SAMSON, C. BARU and S. MATHIER : SAE Technical Paper Series 820335
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