Mohamed Mustakim, Nurul Syafiqah, et al. “Optimizing Hydrophilicity in NiO Graphene Composites Via Stearic Acid Treatment for Humidity-to-Energy Applications”. International Journal of Integrated Engineering, vol. 16, no. 7, Dec. 2024, pp. 266-79, https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/19095.