Ahmed, A. F., K. A. Aadim, and A. A. Yousef. ‚ÄúSpectroscopic Study of AL Nitrogen Plasma Produced by DC Glow Discharge‚ÄĚ. Iraqi Journal of Science, Vol. 59, no. 1C, Mar. 2018, pp. 494-01, http://scbaghdad.edu.iq/eijs/index.php/eijs/article/view/237.