R. Zapp, B. Ho, and T.S. Chen, "Mapping of Internal Temperature Distribution by Ultrasound," Fifteenth International Symposium on Ultrasonic Imaging, June 1990.
R. Zapp, B. Ho, and T.S. Chen, "Evaluation of Tissue Attenuation Property by a Bidirectional Pulse-Echo Interrogation Technique," Fifteenth International Symposium on Ultrasonic Imaging, June 1990.
R. Zapp, B. Ho, and N.H. Wang, "Nondestructive Evaluation of Material Properties by Broadband Signal Technique," Fifth Technical Conference of the American Society for Composites, June 1990.
R. Zapp, B. Ho, N.H. Wang, and M. Rich, "High Range Resolution Ultrasonic Imaging for Evaluation of Layered Composite Materials," Fifth Technical Conference of the American Society for Composites, June 1990.
R. Zapp and B. Ho, "New Techniques in Ultrasonic Imaging for Evaluation of Composite Materials," Fifth Advanced Composite Conference, 1989.