• Conkright, R. O., L. F. McNamara, The CCIR model of the E-layer critical frequencyFourth International Workshop on Solar-Terrestrial PhysicsInt. Union of Radio Sci.Ottawa, Ont., CanadaMay 18–22, 1992.
  • Dudeney, J. R., The accuracy of simple methods for determining the height of the maximum electron concentration of the F2 layer from scaled ionospheric characteristics, J. Atmos. Terr. Phys., 458/9, 629640, 1983.
  • McNamara, L. F., Quality control of true height profiles obtained automatically from digital ionogramsTech. Rep. AFGL-TR-86-0098Air Force Geophys. Lab., Hanscom Air Force Base, Mass., 1986.
  • McNamara, L. F., B. W. Reinisch, Observations of the mid-latitude F1 region, Adv. Space Res., 153, (2)67(2)75, 1995.
  • McNamara, L. F., B. W. Reinisch, J. S. Tang, Values of hmF2 deduced from automatically scaled ionograms, Adv. Space Res., 76, 5356, 1987.
  • Paul, A. K., The MUF(3000) as an indicator for F-region variationsTech. Rep. 1204Naval Ocean Syst. Cent., San Diego, Calif.January, 1988.
  • Rosich, R. K., W. B. Jones, The numerical representation of the critical frequency of the F1 region of the ionosphereRep. OT 73-22Off. of Telecommun., Washington, D. C.October, 1973.
  • Titheridge, J. E., Ionogram analysis with the generalized program POLANRep. UAG-93World Data Cent. A, Boulder, Colo.December, 1985.