“OPTIMUM YEARLY TILTED ANGLE OF PHOTOVOLTAIC CELL TO RECEIVE MAXIMUM SOLAR RADIATION IN SOUTHERN IRAQ CITIES”. University of Thi-Qar Journal for Engineering Sciences 5, no. 1 (June 1, 2014): 1–14. Accessed January 16, 2025. http://jeng.utq.edu.iq/index.php/main/article/view/596.