Ashari, Dedy, and Djatmiko Ichsani. “Eksperimental Study the Effect of Additional Flat Plate Reflector to Performance the Sinusoidal Solar Water Heater”. IPTEK The Journal of Engineering 5, no. 1 (September 2, 2025): 9–13. Accessed January 27, 2026. https://journal.its.ac.id/index.php/joe/article/view/8037.