N. . Salimun and H. Mohamad, “Investigation of Particle Gradation Effect on Soil-Rock Mixture Using Direct Shear Test ”, IJIE, vol. 16, no. 4, pp. 23–30, Aug. 2024, Accessed: Aug. 07, 2026. [Online]. Available: https://journal.uthm.edu.my/index.php/ijie/article/view/16197