M. R. Hasrul, M. J. Rahman, A. R. A. P. Helmy, T. Natsir, and A. R. Asrib, “Sustainable Lightweight Concrete Using Candlenut Shell as Coarse Aggregate: The Impact of Water-Cement Ratios on Strength and Density”, J. civil eng. forum, vol. 11, no. 3, pp. 257-266, Jul. 2025.