Heni Pujiastuti, Ahmad Rifa, Agus Darmawan Adi, and Teuku Faisal Fathani, “THE EFFECT OF MATRIC SUCTION ON THE SHEAR STRENGTH OF UNSATURATED SANDY CLAY”, INTERNATIONAL JOURNAL OF GEOMATE, vol. 14, no. 42, pp. 112–119, Feb. 2018.