Fahriza, Fahriza, et al. “Lightweight Hollow Block Production Using Recycled Expanded Polystyrene and Coconut Coir: An Experimental Assessment”. CIRCULIZER: Journal of Circular Systems, Innovation, and Technology, vol. 1, no. 1, Feb. 2026, pp. 74-87, https://doi.org/10.62671/circulizer.v1i1.256.