Premvaranon, P., and A. Teralapsuwan. “Energy Comparison of the Optics and Tracking System for Evacuated Solar Thermal Collector by Using Ray Tracing Analysis”. Journal of Research and Applications in Mechanical Engineering 2, no. 1 (October 7, 2018): 74–83. Accessed May 18, 2024. https://ph01.tci-thaijo.org/index.php/jrame/article/view/149432.