M. Li, N. H. A. S. Lim, M. D. K. Awalluddin, and T. C. Yoon, “COAL GANGUE AS AGGREGATE IN CONCRETE: A REVIEW ON PHYSICOCHEMICAL PROPERTIES, MODIFICATION TECHNIQUES, AND PERFORMANCE IMPACTS”, IJIREV, vol. 8, no. 25, pp. 201–226, Jun. 2026.