1. ASTM D6938-17a, (2017). Standard Test Methods for In-Place Density and Water Content of Soil and Soil-Aggregate by Nuclear Methods (Shallow Depth). Annual Book of ASTM Standards, Vol. 04.03, ASTM International, West Conshohocken, PA.
2. AASHTO T 310-19, (2019). Standard Specification for In-Place Density and Moisture Content of Soil and Soil-Aggregate by Nuclear Methods (Shallow Depth). Standard Specifications for Transportation Materials and Methods of Sampling and Testing, And AASHTO Provisional Standards, 2019 edition, Washington, D.C.
3. ASTM D1556-15, (2015). Standard Test Method for Density and Unit Weight of Soil in Place by Sand-Cone Method. Annual Book of ASTM Standards, Vol. 04.03, ASTM International, West Conshohocken, PA.
4. AASHTO T 191, (2014). Standard Method of Test for Density of Soil In-Place by the Sand-Cone Method. Standard Specifications for Transportation Materials and Methods of Sampling and Testing, And AASHTO Provisional Standards, 2014 edition, Washington, D.C.
5. Resilient Cross Anisotropic Behavior of Granular Base Materials Under Repetitive Loading;Rowshanzamir,1995