B. Tawfik, Mohammed, and Kamal A. Mohammed. “The Effect of Niobium and Vanadium on the Toughness of High Strength Alloyed Line Pipe Steel Used in Gas & Oil Pipeline”. Journal of Engineering and Sustainable Development 14, no. 2 (June 1, 2010): 1–16. Accessed June 4, 2026. https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/1453.