1. Photographic Considerations for Aerospace (Itek Corporation) Chapter 3.
2. Cox, A. Symposium on the Evaluation of Optical Imagery, 1951. NBS Circular 526,267 (1954).
3. Shack, R. V., Ibid.
4. Attaya, W. L. Study of Image Evaluation Techniques, Report No. AFAL TR-66-343 Nov. 1966 (Itek Corporation).