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2. Inventor's Certificate No. 991,098 (USSR), MKI F 16 J 15/18. Gland Shaft Packings.
3. V. A. Martsinkovskii, Hydrodynamics and Strength of Centrifugal Pumps [in Russian], Mashinostroenie, Moscow (1970).
4. I. V. Kragel'skii and N. I. Mikhin, Frictional Units in Machines. A Handbook [in Russian], Mashinostroenie, Moscow (1984).