1. W. Brown and J. Srawley, Fracture Toughness Tests of High-Strength Metallic Materials in Plane Deformation [Russian translation], Mir, Moscow (1972).
2. Standard Method of Test for Plane-Strain Fracture Toughness of Metallic Materials, Annual Book of ASTM Standards, Part 10, E 399-74, (1974), pp. 412?451.
3. D. O. Harris, ?Stress intensity factors for transversely loaded elastic plates and their application to prediction of crack arrest,? Eng. Fract. Mech.,4, No. 2, 227?294 (1972).
4. V. V. Panasyuk, A. E. Andreikiv, and S. E. Kovchik, Methods of Determining the Crack Resistance of Constructional Materials [in Russian], Naukova Dumka, Kiev (1977).