Mohammed, Mohammed F., and Dina J. Matti. “Analytical Study of Water Purity Using Low Power He:Ne Laser”. Nahrain University College of Engineering Journal 14, no. 1 (March 26, 2011): 102–108. Accessed December 23, 2024. https://oldjournal.eng.nahrainuniv.edu.iq/index.php/main/article/view/609.