1. Johnson, J. EG & G Idaho Inc., Idaho Falls, Idaho, (1981)
2. Conference on the Periodic Inspection of Pressure Vessels;Frederick,1979
3. Principles of Optics;Born,1975
4. Some Early Developments in Synthetic Aperture Radar Systems;Sherwin;IRE Trans MIL-6,1962
5. Flaherty, J.J. et al., Synthetic Aperture Ultrasonic Imaging Systems US Patent No. 3548642, (1967)