• Bennett, J. A., P. L. Dyson, and R. J. Norman (2004), Progress in radio raytracing in the ionosphere, Radio Sci. Bull., 310, 8191.
  • Bilitza, D. (2001), International Reference Ionosphere, Radio Sci., 36, 261273.
  • Budden, K. G. (1985), The Propagation of Radio Waves in the Ionosphere, Cambridge Univ. Press, New York.
  • Haselegrove, J. (1957), Oblique ray path in the ionosphere, Proc. Phys. Soc., London, Sect. B, 70, 653.
  • Huang, X., and B. W. Reinisch (1996), Vertical electron density profiles from the digisonde network, Adv. Space Res., 18, 121129.
  • Poeverlein, H. (1948), Strahlenwege von Radiowellen in der Ionosphäre (Ray paths of radio waves in the ionosphere), Sitzungsber. Bayer. Akad. Wiss. Math. Naturwiss. Kl., 78, 175178.
  • Reinisch, B. W. (1996), Modern ionosondes, in Modern Ionospheric Science, edited by H. Kohl, R. Rüster, and K. Schlegel, pp. 440458, Eur. Geophys. Soc., Katlenburg-Lindau, Germany.
  • Reinisch, B. W., and D. Bilitza (2004), Karl Rawer's life and the history of IRI, Adv. Space Res., 34, 18451850.
  • Reinisch, B. W., and X. Huang (1983), Automatic calculation of electron density profiles from digital ionograms: 3. Processing of bottomside ionograms, Radio Sci., 18, 477492.
  • Reinisch, B. W., X. Huang, I. A. Galkin, V. Paznukhov, and A. Kozlov (2005), Recent advances in real-time analysis of ionograms and ionospheric drift measurements with digisondes, J. Atmos. Sol. Terr. Phys., 67, 10541062.
  • Snyder, M. A. (1966), Chebyshev Methods in Numerical Approximation, Prentice-Hall, Upper Saddle River, N. J.