1. ASTM D 5298 – 94. Standard test method for measurement of soil potential (suction) using filter paper, 4.09; 1995. p. 154–9.
2. Boyce JR. A non linear model for the elastic behaviour of granular materials under repeated loading. In: International symposium on soils under cyclic and transient loading, Swansea. p. 285–94.
3. Brooks RH, Corey AT. Hydraulic properties of porous medium. Hydrology paper. No. 3. Civ Eng Dep. Fort Colins (Colo): Colorado State Univ; 1964.
4. CAST 3M. CAST 3M is a research FEM environment; its development is sponsored by the French Atomic Energy Commission; 2010. .
5. Subgrade resilient modulus correction for saturation effects;Drumm;J Geotech Geoenviron Eng ASCE,1997