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2. Sines G., Waisman J. L.: Metal Fatigue. McGraw-Hill Book Company, Inc., New York 1959.
3. Frith P. H.: JISI180 (1955), 26.
4. Duckworth W. E., Ineson E.: ISI Spec. Report No 77 (1962), 57.
5. Thompson R. F.: Trans. ASM56 (1963), 803.