Mohamad, Norhidayah., and A. Shaaban. “Optimizing the Urea Granule Size by Taguchi Approach”. International Journal of Engineering and Technology 7, no. 4.36 (December 9, 2018): 1534–1536. Accessed March 28, 2025. https://www.sciencepubco.com/index.php/IJET/article/view/29366.