M H Hussin, M. N. M. A. R. M. Z. “Physical Properties of Cassava (Manihot Esculenta) Based on Gel Polymer Electrolyte for Zinc-Air Battery”. International Journal of Advanced Science and Technology, Vol. 28, no. 20, Dec. 2019, pp. 1219 -, http://sersc.org/journals/index.php/IJAST/article/view/3757.