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3. L. G. Loitsyanskii, ?The propagation of a twisted jet in an unbounded space fille with the same liquid,? Prikl. Mat. i Mekhan.,17, No. 1 (1953).
4. J. O. Hinze, Turbulence: Its Mechanism and Theory, McGraw-Hill (1959).
5. A. A. Townsend, The Structure of Turbulent Shear Flow, Cambridge University Press.