Hussain, Mohammed, and Sarah Ahmed. “Sulfur Hexafluoride (SF6) Trace Gas Sensing Using Modulated CO2 Laser Beam”. Iraqi Journal of Laser 17, no. A (November 19, 2017): 9-15. Accessed November 26, 2019. http://ijl.uobaghdad.edu.iq/index.php/IJL/article/view/28.