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3. Standard Test Method for JIC, A Measure of Fracture Toughness, E813-89, Annual Book of ASTM Standards, vol. 03.01, ASTM, 1991
4. British Standard Methods for Crack Opening Displacement (COD) Testing, BS5762 (1979)
5. J.F. Knott, Fundamentals of Fracture Mechanics, Butterworth, London, 1974