S. F. Abd Karim, J. Jai, K. H. Ku Hamid, M. H. Mior Muzamin, N. Kamarrudin, and R. A. Abdol Aziz, “Full Factorial Design Analysis and Characterization of Polyethylene, Starch and Aloe Vera Gel Thin Film Formulation”, Int. J. Adv. Sci. Eng. Inf. Technol., vol. 11, no. 6, pp. 2139–2147, Dec. 2021.