1. Aircraft Trailing Vortices and Downwash Phenomenon
2. M. J. Rees, The Very Early Universe (Cambridge University Press, Cambridge, 1983), p. 275.
3. H. R. Miller and P. J. Witta, Active Galactic Nuclei (Springer, New York, 1987), p. 202.
4. E. Tandberg-Hansen and A. G. Emslie, The Physics of Solar Flares (Cambridge University Press, Cambridge, 1988), p. 124.