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3. Yu. P. Zheltov and S. A. Khristianovich, “Hydraulic fracturing of oil-bearing seam,” Izv. AN SSSR, No. 5 (1955).
4. Yu. P. Zheltov, “Formation of vertical cracks by filterable fluid,” Izv. ANSSSR, No. 8 (1957).
5. S. A. Khristianovich, “Investigations into the mechanisms of hydraulic fracturing of a seam,” in: Proceedings of the Institute of Geology and Combustible Mineral Recovery [in Russian], 12, AN SSSR, Moscow (1960).