1. Fundamental Physics of Radiology;Meredith,1972
2. Astbury, J.: Private communication.
3. Panelete, brochure published by Den-Tal-Ez Mfg. Co., 1978.
4. Intrex, brochure published by S.S. White Dental Products International, 1980.
5. Theory of Extraction and Optimization of Information Content in Diagnostic Roentgenology;Pillai,1980