1. J. Goodier, “Mathematical theory of equilibrium cracks,” in: Fracture, Vol. 2, Academic Press, New York and London (1968).
2. C. G. Liebowitz, “Mathematical theory of brittle fracture,” in: Fracture, Vol. 2, Academic Press, New York and London (1968).
3. J. Rice, “Mathematical methods in failure mechanics,” in: Fracture, Vol. 2, Academic Press, New York and London (1968).
4. O. Zienkiewicz, The Finite Element Method in Engineering Science, McGraw-Hill (1971).
5. M. M. Muzdakbaev and V. S. Nikiforovski, “Compressive strength of materials,” Prikl. Mekh. Tekh. Fiz., No. 2 (1978).