1. G. I. Pokrovskii and A. A. Chernigovskii, Calculations of Charges for Large-Scale Blasting Down [in Russian] Gosgortekhizdat, Moscow (1963).
2. N. Ya. Repin and M. I. Potapov, in: Technology and Economics of Coal Cutting by the Open-Cut Method [in Russian] (symposium), TsNIITÉIUglya, Moscow, No. 3 (1965).