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2. A. A. Wells, British Welding Journal,(November 1963) 563
3. A. A. Wells, Engineering Fracture Mechanics, 1 (1969) 399
4. Practical Fracture Mechanics for Structural Steel, M. 0. Dobson, ed., (1969) UKAEA with Chapman and Hall
5. ASTM Tentative Method of Test E 299-70T, ASTM Standards, 31 (1970)