I. Abdullah, Oday, Ehsan Sabah M. Z. Ameen, and Wassan Safaa Abd Al-Sahb. 2008. “A Finite Element Analysis of Damaged Composite Sheet”. Journal of Engineering and Sustainable Development 12 (4): 1-19. https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/1642.