D. A. Firmansyah, A. K. Somantri, A. V. R. Sihombing, L. Z. Mase, and A. Sundara, “Mechanical Properties of Soft Clay Soil Improved with Nanomaterials and Chitosan Biopolymer”, SEAGS-AGSSEA Journal, vol. 55, no. 2, pp. 31–37, Jun. 2024.