“Effect of Polyurethane (PUR) Core Density of Sandwich Elements With Two Metal Layers on Their Resistance to Tensile Stresses”. Latakia University (formerly Tishreen) Journal for Research and Scientific Studies - Engineering Sciences Series, vol. 48, no. 3, Aug. 2026, pp. 263-75, https://journal.latakia-univ.edu.sy/index.php/engsc/article/view/21737.