1. E. N. Sher, “Investigation of the dynamics of crack development by the photoelasticity method,” Zh. Prikl. Mekh. Tekh. Fiz., No. 6 (1974).
2. A. P. Bobryakov, G. N. Pokrovskii, and B. N. Serpeninov, “Determination of energy expenditures in impact wedging of solids,” in: Problems of Rock Fracture Mechanics [in Russian], Izd. IGD Sib. Otd. Akad. Nauk SSSR, Novosibirsk (1976).
3. G. P. Cherepanov, Brittle Fracture Mechanics [in Russian], Nauka, Moscow (1974).
4. F. Ouchlerlony, Fracture Mechanics applied to Rock Blasting. Swedish Detonic Research Foundation. Report DS1973: 29, Sthlm (1973).
5. E. N. Sher, “A case of equilibrium of a system of radial cracks,” Zh. Prikl., Mekh. Tekh. Fiz., No. 5 (1974).