Joko, Tri, Erlina, and Doni Pratama. “Design, Construction, and Performance Analysis of a Portable Solar Panel for Efficient Smartphone Charging”. JOURNAL ZETROEM 8, no. 2 (July 3, 2026): 155–169. Accessed July 12, 2026. https://ejournal.unibabwi.ac.id/index.php/Zetroem/article/view/8137.