Angham Elias Abdul Muhsen, Prof. Dr. Ebtahag Z. Sulyman. “IMPROVING MECHANICAL AND THERMAL PROPERTIES FOR UNSATURATED POLYESTER RESIN BY ADDING GYPSUM”. Chelonian Research Foundation, vol. 19, no. 01, July 2024, pp. 1123-4, https://acgpublishing.com/index.php/CCB/article/view/861.