NA’MAN, S.; YACOOB, H. Y.; OMAR, O. S. Optimum Tilt Angle for South Facing Flat Solar Collectors in Duhok City. Science Journal of University of Zakho, [S. l.], v. 1, n. 1, p. 405–413, 2013. Disponível em: https://sjuoz.uoz.edu.krd/index.php/sjuoz/article/view/98. Acesso em: 8 may. 2024.