1. V. V. Panasyuk, A. E. Andreikiv, and S. E. Kovchik, Methods for the Evaluation of the Crack Resistance of Structural Materials [in Russian], Naukova Dumka, Kiev (1977).
2. GOST 25.506-85. Strength Analysis and Tests. Methods for Mechanical Testing of Metals. Determination of the Characteristics of Crack Resistance (Fracture Toughness) under Static Loading [in Russian], Izd. Standartov, Moscow (1985).
3. V. V. Panasyuk, Limiting Equilibrium of Brittle Cracked Bodies [in Russian], Naukova Dumka, Kiev (1968).
4. BSI-DD19: Methods for Crack Opening Displacement (COD) Testing, British Standard Institution (1978).
5. I. Ingham, G. R. Egan, D. E. Iliott, and T. C. Harisson, The Effect of Geometry on the Interpretation of COD Test Data, Practical Application of Fracture Mechanics to Pressure Vessel Technology (1971).