Hejna, A., P. . Kosmela, M. . Barczewski, O. . Mysiukiewicz, and A. . Piasecki. “Copper Slag As a Potential Waste Filler for Polyethylene-Based Composites Manufacturing”. Tanzania Journal of Science, vol. 47, no. 2, May 2021, pp. 405-20, doi:10.4314/tjs.v47i2.1.