Nabuuma, Racheal, Dan Tigalana, and Daniel Otim. “Effect of Cow Dung Ash and Recycled Concrete Aggregates on the Mechanical and Physical Properties of Concrete: Central Composite Design (CCD) Optimisation”. East African Journal of Engineering 6, no. 1 (November 15, 2023): 167-187. Accessed August 27, 2025. https://www.journals.eanso.org/index.php/eaje/article/view/1573.