Hassan, Jafar M., Qussai J. Abdul-Ghafour, and Mohammed F. Mohammed. 2015. “Influences of the Twisted Strips Insertion on the Performance of Flat Plate Water Solar Collector”. Al-Khwarizmi Engineering Journal (Alkej) 11 (3):37-47. https://alkej.uobaghdad.edu.iq/index.php/alkej/article/view/242.