Shakohe, Rawad. 2023. “Study the Effect of Adding Materials (Calcine Powder Styropor Granules and Straw) on the Compressive Strength for Material Polyurethane”. Latakia University Journal -Engineering Sciences Series 45 (1):143-54. https://journal.tishreen.edu.sy/index.php/engscnc/article/view/13725.