Rudžionis, Žymantas, and Ernestas Ivanauskas. “Investigations into Effective Fly Ash Used in Concrete”. Journal of Civil Engineering and Management 10, no. 4 (December 31, 2004): 303-309. Accessed July 6, 2024. https://jau.vgtu.lt/index.php/JCEM/article/view/9000.