1. V. V. Panasyuk and A. E. Andreikiv, Fiz.-Khim. Mekhan Mat.,5, No. 2 (1969).
2. A. E. Andreikiv, Author's Abstract of Candidate Dissertation, L'vov State University, L'vov (1969).
3. V. V. Panasyuk, Ultimate Equilibrium of Brittle Bodies with Cracks [in Russian], Naukova Dumka, Kiev (1968).
4. L. I. Sedov, Similarity and Dimensionality Methods in Mechanics [in Russian], Nauka, Moscow (1965).
5. M. Isida, Intern. J. Fracture Mechanics,7, No. 3 (1971).