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| | May 1995 (Site not responding. Last check: 2007-10-10) |
 | | Bray, Don E., "Ultrasonic Stress Measurement In Pressure Vessels," To be presented 2001 ASME Pressure Vessels and Piping Conference, Atlanta, Georgia, 23-27 July, 2001. |
 | | Bray, Don E., and McGrath, Scott, "Fracture Toughness Prediction in AISI 4137 Alloy Steel using Ultrasonic Frequency Analysis," To be presented Second Pan-American Conference for Nondestructive Testing (PACNDT) and International Chemical and Petroleum Industry Inspection Technology (ICPIIT) VII Topical Conference, Houston, Texas, The American Society for Nondestructive Testing, June 2001. |
 | | Bray, D. E., and Gad, G. S., "The Development of an NDE Centre in Papua New Guinea to Serve the Petroleum and Chemical Industries," International Chemical and Petroleum Industry Inspection Technology, V Topical, Houston, Texas, The American Society for Nondestructive Testing, June 16-18, 1997. |
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