Ismail, M. R., Z. A. Abdul Majid, S. I. Ihsan, M. S. Mohd Azmi, K. Sopian, and H. A. A. Moria. “Optimization of Solar Hybrid Gravity System With Battery Energy Storage for Elevation Systems”. Journal of Science and Mathematics Letters, vol. 12, no. 2, July 2024, pp. 151-60, doi:10.37134/jsml.vol12.2.12.2024.