Taverne, Jonas, Muhammad-Sukki, Firdaus, Ayub, Ahmad Syahir, Sellami, Nazmi, Abu-Bakar, Siti Hawa, Bani, Nurul Aini, Mas'ud, Abdullahi Abubakar, Iyi, Draco, "Design of solar powered charging backpack.", International journal of power electronics and drive systems, 2018