Na’man, S., Yacoob, H. Y. and Omar, O. S. (2013) “Optimum Tilt Angle for South Facing Flat Solar Collectors in Duhok City”, Science Journal of University of Zakho, 1(1), pp. 405–413. Available at: https://sjuoz.uoz.edu.krd/index.php/sjuoz/article/view/98 (Accessed: 7 May 2024).