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2. J.D. Landes and J.A. Begley,loc. cit. 211?254.
3. T.K. Hellen,loc. cit. 255?286.
4. D.G.H. Latzko,loc. cit. 287?292.
5. J.D. Landes and J.A. Begley, ASTM-STP 514 (1972) 1?23.