Alaj, Anjeza, Visar Krelani, and Tatsuya Numao. “Effect of Class F Fly Ash on Strength Properties of Concrete”. Civil Engineering Journal 9, no. 9 (September 1, 2023): 2249–2258. Accessed July 1, 2025. https://www.civilejournal.org/index.php/cej/article/view/4219.