Fondjo, Armand Augustin, Elizabeth Theron, and Richard P. Ray. “Unsaturated Shear Strength Assessment Based on Soil Index Properties”. Theory and Applications of Engineering Research Vol. 2 (January 3, 2024): 67–94. Accessed June 4, 2026. https://stm.bookpi.org/TAER-V2/article/view/12948.