Haider, Haider Mohammed Jawad. 2017. “Calculated of Vibrational Frequencies for Molecular System from Sulphur-Halides in the Infrared Region by Using the Semi Empirical Programs”. Al-Qadisiyah Journal of Pure Science 20 (1), 146-58. https://journalsc.qu.edu.iq/index.php/JOPS/article/view/440.