et.al, A. L. M. R. (2017) “Application of Normal and Derivative Ultraviolet Absorption Spectroscopy for the Determination of Six Polyaromatic Hydrocarbons in Tigris River”, Al-Qadisiyah Journal of Pure Science, 19(2), pp. 97-103. Available at: https://www.journalsc.qu.edu.iq.51-77-64-103.cpanel.site/index.php/JOPS/article/view/184 (Accessed: 18January2026).