L. Zou, and E.C. Leong. “A Classification Tree Guide to Soil-water Characteristic Curve Test for Soils with Bimodal Grain-size Distribution”. Geotechnical Engineering Journal of the SEAGS & AGSSEA, vol. 50, no. 1, Mar. 2019, pp. 28-36, doi:10.14456/seagj.2019.58.