1. N. N., Fracture toughness testing and its application, ASTM STP 381 (1965).
2. N. N., Plane strain crack toughness testing of high strength metallic materials, ASTM STP 410 (1966).
3. N. N., Standard method of test for plane strain fracture toughness of metallic materials, ASTM E399-74.
4. «Bruchmechanik» in «Grundlagen des Festigkeits- und Bruchverhaltens», Herausgeber: Verl. Stahleisen, Düsseldorf 1974.
5. Unstable crack propagation in metals: cleavage and fast fracture, Proc. Crack Propagation Symposium Cranfield, Sept. 1961.