Newman, A. ., N. I. . Halim, M. N. . Muhd Sidek, H. . Mohd Saman, and A. . Alisibramulisi. “Enhancement of High Strength Concrete Performance By Utilising Nano Waste Paper Sludge Ash”. Scientific Research Journal, vol. 18, no. 2, Aug. 2021, pp. 89-101, doi:10.24191/srj.v18i2.11398.