Muhsin, Fulath Abdul-Redah. 2014. “Comparability Study Between Digital and Visual Colorimeter by Using of Chlorine Indicators of DpD No.1 and DpD No.3 under Practical Conditions”. Al-Kufa University Journal for Biology 6 (1). https://journal.uokufa.edu.iq/index.php/ajb/article/view/8184.