Z. Othman, S. I. Sulaiman, I. Musirin, A. M. Omar, S. Shaari, and M. Z. Rosselan, “Sizing Optimization of Hybrid Stand Alone Photovoltaic System”, Int. J. Adv. Sci. Eng. Inf. Technol., vol. 7, no. 6, pp. 1991–1997, Dec. 2017.