Abdala, Zainab Mahmood, Amel Naji Wadi, Zainab Shaye Hassan, and Hadi kareem Dahaam. 2018. “Limited of Optimum Method for Separation Xylene Isomers by Gas Chromatography”. Al-Nahrain Journal of Science 18 (1): 55-59. https://mail.anjs.edu.iq/index.php/anjs/article/view/349.