“MODEL FOR PREDICTING MIX FORMULATION IN THE PRODUCTION OF INSULATING REFRACTORY BRICKS USING NIGERIAN FIRE-CLAYS AND COCONUT SHELL”, NIJOTECH, vol. 38, no. 3, pp. 654–659, Jun. 2019, Accessed: May 14, 2026. [Online]. Available: https://www.nijotech.com/index.php/nijotech/article/view/2055