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2. A. I. Savich and A. D. Mikhailov, ?Principles of engineering-geologic classification of rocks according to seismoacoustic data,? in: Summaries of Reports of the Sixth Conference of Surveyors of Gidroproekt [inRussian], Gidroproekt, Moscow (1978).
3. A. I. Savich et al., Seismoacoustic Methods of Investigating Rock Masses [in Russian], Nedra, Moscow (1969).