Marullah Ridwan, A., Mansor, M.R., Tamaldin, N., Sudrajat, A., Repi, V.V.R. and Latief, F.H. 2025. The effects of voltage variations and surface on the performance of an HHO generator using a NaOH catalyst. Engineering and Applied Science Research. 52, 3 (May 2025), 308–316.