1. H. R. Reed and C. M. Russell, Ultra High Frequency Propagation, Chapman and Hall, Ltd., London, 1966.
2. C. R. Burrows and S. S. Attwood, Radio Wave Propagation, Academic Press, Inc., New York, 1949.
3. B. R. Bean, B. A. Cahoon, C. A. Samson, and G. D. Thayer, A World Atlas of Atmospheric Radio Refractivity, U.S. Government Printing Office, Washington, D.C., 1966.
4. D. E. Kerr, Propagation of Short Radio Waves, Boston Technical Publishers, Lexington, Mass., 1964, pp. 41–46.
5. R. S. Berkowitz, Modern Radar Analysis, Evaluation and System Design, John Wiley & Sons, Inc., New York, 1965, Part V.