“Technologies for Removal of Hazardous Materials from Subsurface Environment”, 1st International Symposium on Systems & Human Science, Osaka, Japan, Nov. 2003, by Cal Christensen.
“Development of Deployment Technologies for Long-Term Subsurface Monitoring Sensors”, Spectrum 2002, by David M. Weinberg, Cal D. Christensen.
“Driving Point Impedance—A New PARADIGM for Detecting Fracture and In Situ Stress in Boreholes”, SME 2002, by David M. Weinberg, Jack H. Cole, Robert R. Reynolds, Cal D. Christensen and Stephen R. Novascone.
"Tank Riser Characterization System," ANS 1994 Annual Meeting, June 19-23, 1994.
"Light Duty Robotic Arms for the Characterization of Underground Storage Tanks," Spectrum '92, Nuclear and Hazardous Waste Management International Topical Meeting, August 23-27, 1992.
"Remote Inspections of Underground Storage Tanks," American Nuclear Society 1992 Summer Meeting, June 8-12, 1992.
"Remote Inspection at the Idaho National Engineering Laboratory," American Nuclear Society 1992 Summer Meeting, June 8-12, 1992.