1. I. L. Povkh, Aerodynamic Experimentation in Machine Building [in Russian], Mashinostroenie, Leningrad (1974).
2. GOST 17380–2001, Seamless Welded Pipeline Components Formed from Carbon and Low-Alloy Steel. General Technical Specifications. Section 5.1.3.5.
3. A. E. Zaryankin, T. B. Zhirgalova, and V. V. Osintsev, USSR Author’s Certificate No. 879126, “Pipeline” (1981).
4. L. Levine, USSR Author’s Certificate No. 476762, “Pipeline fitting” (1975).
5. M. G. Selnitsyn, V. A. Lupin, and P. A. Kamerlokher, Soviet Union Author’s Certificate No. 1492171 A1, “Wearresistant bimetallic pipe elbow” (1989).