Fuada S, P FH, Kusumawardhana A, Suharmanto P. A Study in Developing a Charger Helmet as Power Bank of Mobile Phone for Motorcyclists. KEn [Internet]. 2015Nov.1 [cited 2024May7];1(1):146-52. Available from: https://knepublishing.com/index.php/KnE-Energy/article/view/337