1. V. V. Kuznetsov, V. A. Chernikov, and A. G. Merzon, “On methods of breaking hard rocks for combined drivage of mine workings,” Tr. GIGKhS, No. 29, Moscow (1974).
2. V. V. Gushchin et al., “Investigation of drivage of mine workings by entry drifting machines with electrothermal rock breaking,” Fiz.-Tekh. Probl. Razrab. Polezn. Iskop., No. 6 (1973).
3. G. A. Vartanov and yu. I. Protasov, Application of Infrared Radiation for Rock Breaking [in Russian], Erevan (1970).
4. V. V. Rzhevskii and Yu. I. Protasov, Electrical Rock Breaking [in Russian], Moscow (1972).