1. G. K. Batchelor, Axial Flow in Trailing Line Vortices,Journal of Fluid Mech., 20 (1964) 645.
2. A. Erdelyiet al., Higher Transcendental Functions, Vol. I, McGraw-Hill, New York (1953).
3. S. Goldstein,Modern Developments in Fluid Dynamics, Vol. I, Dover, New York (1965).
4. H. Görtler,Theoretical Investigation of the Laminar Boundary Layer. Problem II?Decay of Swirl in an Axially Symmetric Jet, Far From the Orifice, Report for U. S. Air Force (Office of Scientific Research) 1954.
5. M. G. Hall, The Structure of Concentrated Vortex Cores,Prog. Aeron. Sci., 7 (1966) 53.