Firdous, Rafia, et al. “Evaluation of Mechanical Properties of Concrete Containing Silica Fume from a Local Source in Pakistan: Properties of Concrete Containing Silica Fume from a Local Source in Pakistan”. Proceedings of the Pakistan Academy of Sciences: A. Physical and Computational Sciences, vol. 54, no. 2, Apr. 2021, pp. 119–125, http://ppaspk.org/index.php/PPAS-A/article/view/238.