Lestari, Utami Sylvia, et al. “Analysis of the Utilization of Combustion Waste Ash from Palm Kernel Shell As a Substitute for Fine Aggregates in Cement Treated Base Class B”. Engineering And Technology Journal, vol. 8, no. 11, Nov. 2023, pp. 3092-0, doi:10.47191/etj/v8i11.18.