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2. J. D. Landes and J. A. Begley, ?Test results from J integral studies: An attempt to establish a J Ic testing procedure?. ASTM STP 560 (1974) 170?186.
3. J. A. Begley and J. D. landes, ?The J integral as a fracture criterion in fracture toughness?. ASTM STP 514 (1972) 1?20.
4. W. A. Logsdon, ?Elastic-plastic (J Ic) fracture toughness values, their experimental determination and comparison with conventional linear elastic (K Ic) fracture toughness values for five materials?. ASTM STP 590 (1976) 43?60.
5. BS5447:1977, ?Methods of test for plane strain fracture toughness (K Ic) of metallic materials?.