A. H. Al-Obaidi, Ahmed, et al. “Variation of Suction During Wetting of Unsaturated Collapsible Gypseous Soils”.
International Journal of Engineering and Technology
, vol. 7, no. 4.37, Dec. 2018, pp. 79-85,
https://doi.org/10.14419/ijet.v7i4.37.23621
.