Yildizel, S. A., and Y. Arslan. “Flexural Strength Estimation of Basalt Fiber Reinforced Fly-Ash Added Gypsum Based Composites”. Journal of Engineering Research and Applied Science, Vol. 7, no. 1, June 2018, pp. 829-34, http://www.journaleras.com/index.php/jeras/article/view/114.