References 1 Spreiter, J. R. and Sacks, A. H., "The Rolling Up of the Trailing Vortex Sheet and Its Effect on the Downwash Behind Wings," Journal of the Aeronautical Sciences, Vol. 18, January 1951, pp. 21-32. Brown, C. D., "Aerodynamics of Wake Vortices," AIAA Journal, Vol. 11, April 1973, pp. 531-536. 3 Mason, W. H. and Marchman, J. F., Ill, "Far-Field Structure of Aircraft Wake Turbulence," Journal of Aircraft, Vol. 10, Feb. 1973, pp. 86-92. Rossow, V. J., "On the Inviscid Rolled-Up Structure of Lift Generated Vortices," NASA, TMX-62, 224, 1973. Betz, A., "Behavior of Vortex Systems," NACA TM 713; translated from Zeitschrift fuer Angewandte Mathematik und Mechanik, Vol. 12, 1932, pp. 164-174. Donaldson, C. duP., "A Brief Review of the Aircraft Trailing Vortex Problem," AFOSR-TR-71-1910, May 1971, Air Force Office of Scientific Research, Washington, D.C. Moore, D. W. and Saffman, P. G., "Axial Flow in Laminar Trailing Vortices," Proceedings of the Royal Society (London), Ser. A., Vol. 33A, June 1973, pp. 491-508. 8 Jordan, P. F., "Structure of Betz Vortex Cores," Journal of Aircraft, Vol. 10, Nov. 1973, pp. 691-693.