Salman, Marwan, Mahmud Ismail, and Yassr Kahtan. “Effect of Head Types on the Free Vibration and Fatigue for Horizontal LPG Pressure Vessels”. Al-Nahrain Journal for Engineering Sciences 21, no. 4 (December 20, 2018): 494-500. Accessed February 21, 2019. https://nahje.com/index.php/main/article/view/473.