Na’man, Salahaldin, Haval Y. Yacoob, and Omar S. Omar. “Optimum Tilt Angle for South Facing Flat Solar Collectors in Duhok City”. Science Journal of University of Zakho 1, no. 1 (June 30, 2013): 405–413. Accessed December 22, 2024. https://sjuoz.uoz.edu.krd/index.php/sjuoz/article/view/98.