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2. I. M. Shvedov, in: Development of Methods for Predicting Ejection Hazards in Carnallite Strata from EMR [in Russian], Authors dissertation, Moscow State Univ. (1986).
3. V. M. Proskuryakov, A. N. Shabarov, and V. I. Frid, “Natural EMR at edge of strata liable to shock hazards,” in: Safety in Industry [in Russian], No. 4 (1989).
4. V. M. Proskuryakov, A. N. Shabarov, and V. I. Frid, “Rapid evaluation of state of coal strata liable to shock and ejection hazards,” in: Ugol′ [in Russian], No. 3 (1990).
5. V. I. Nikolin, G. A. Lozobko, L. V. Kochegarova, et al., Method of Determining Ejection Hazard Zones in Coal Strata from Mining Operations in Cleaned Out Workings [in Russian], USSR Patent No. 1265369, 17.04.85, Published Info. Bull., No. 39 (1986).