Younis Hussain, Suhayla. 2011. “Experimental Investigation of Condensation of Refrigerants R134a and R12 in Air Cooled Horizontal Condenser”. Journal of Engineering and Sustainable Development 15 (4): 155-72. https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/1314.