H. Jasim, S., W. Alhassan, and Z. T. Almalki. “Egg Shell Powder Reinforced Polypropylene (PP) Composite: Effect of Mechanical and Heat Capacity”. Al-Qadisiyah Journal of Pure Science, Vol. 25, no. 3, June 2020, pp. Phys 16-27, doi:10.29350/qjps.2020.25.3.1109.