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2. The decay of a turbulent swirl in a pipe;Kreith;J. Fluid Mech.,1965
3. Heat transfer in free swirling flow in a pipe;Hay;J. Heat Tran.,1975
4. Heat Transfer, Mass Transfer and Hydrodynamics of Swirling Flows in the Axisymmetric Channels;Shchukin,1982
5. A.A. Khalatov, Swirling Flow: Fundamentals and Applications,1989, Naukova Dumka (Publishers), Kiev (in Russian).