“Mixture Design Optimization of Millet Husk Ash, Calcium Carbide Residue, and Nano Silica for Sustainable Concrete” (2026) Environmental Technology & Science Journal, 17(1), pp. 159–173. Available at: https://journal.futminna.edu.ng/index.php/etsj/article/view/248 (Accessed: 8 June 2026).