1. Microwave Transmission over Water and Land under Various Meteorological Conditions, Pearl J. Rubenstein, I. Katz, L. J. Neelands, and R. M. Mitchell, OEMsr-262, Division 14 Report 547, RL, June 13, 1944. CP-311-M4
2. Meteorological Equipment for Short Wave Propagation Studies, Walter M. Elsasser, Report WPG-3, CUDWR, August 1944.
3. Atmospheric Refraction, A Qualitative Investigation, Lloyd J. Anderson, F. P. Dane, J. P. Day, R. F. Hopkins, L. G. Trolese, and A. P. D. Stokes, BuShips Problem X4–49CD, Report WP-17, NRSL, Dec. 28, 1944. CP-222-M9
4. Transmission of Plane Waves Through a Single Stratum Separating Two Media (Part II), John B. Smyth, BuShips Problem X4–49CD, Report WP-13, NRSL, June 23, 1944. CP-221-M9
5. Proceedings of the Institute of Radio Engineers, R. C. Colwell, 27, October 1939, pp. 626–634.