Ridwan Arief Subekti, “Effect of the Number of Blades and Variations in Position of Straight Blades on Vortex Turbine Efficiency”, IJIE, vol. 17, no. 4, pp. 301–315, Nov. 2025, Accessed: Apr. 09, 2026. [Online]. Available: https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/22892