1. Improved Ultrasonic Nondestructive Testing of Pressure Vessels;Frederick,1976
2. Specification for The University of Michigan Synthetic Aperture Ultrasonic Imaging System;Frederick,1976
3. Improved Ultrasonic Nondestructive Testing of Pressure Vessels;Frederick,1977
4. Improved Ultrasonic Nondestructive Testing of Pressure Vessels;Frederick,1978
5. Frederick, J.R., Vanden Broek, C. Improved 3-D Imaging and Display of Flows From Synthetic Aperture Ultrasonic Imaging, Mech. Eng. Dept., University of Michigan (undated)