1. Minimizing Errors in Gamma-Ray Surface-Type Density Gages: Existing Gages and New Design Concepts;Dunn;Highway Research Record No. 301,1970
2. Density and Moisture Content Measurement by Nuclear Methods;Gardner,1967
3. A Calibration Model for Optimizing the Air-Gap Method of Compensating Nuclear Density Gauges for Soil Composition Variations;Gardner;J. Materials,1967
4. Optimization of a Dual-Gauge Principle for Gamma-Ray Backscatter Density Gauges;Dunn,1970
5. A Quality Factor Concept for Evaluation of the Surface Type Gamma-Gamma-Ray Backscatter Soil Density Gauges;Gardner;Nuclear Eng. Design,1971