Ali A. F. Al- Hamadani. An Assessment the Efficiency for A Parabolic Trough Solar Collector with Different Horizontal Axis by Using Tracking System. DJES [Internet]. 2017 Mar. 1 [cited 2024 Nov. 22];10(1):48-57. Available from: https://mail.djes.info/index.php/djes/article/view/221