1. Laboratory Evaluation of the Geogauge and Light Falling Weight Deflectometer as Construction Control Tools
2. ASTM, 1992. Standard test method for CBR (California Bearing Ratio) of Laboratory-Compacted Soils. ASTM D 1883-92
3. ASTM, 1996. Standard test method for density and unit weight of soil in place by the sand-cone method. ASTM D 1556-90
4. ASTM, 1998. Standard test method for laboratory determination of water (moisture) content of soil and rock by mass. ASTM D 2216-98