1. Gabor, D., Proc. Roy. Soc., A, 197, 454 (1949).
2. Gabor, D., U.S. Patent 2,770,166.
3. Parrent, G., Thompson, B., Ward, J., and Justh, B., 237th Meeting Amer. Meteorol. Soc., Washington, D.C. (April 1965).
4. Leith, E., and Upatnieks, J., J. Opt. Soc. Amer., 52, 1123 (1962).
5. Lohman, A., Optica Acta, 3, 97 (1956).