Sakti, Gunawan, and Triyogi Yuwono. 2025. “Performance Study of Installed an I-65o Type Cylinder at The Upstream of Returning Blade of Savonius Wind Turbine, Comparison With Conventional Savonius Wind Turbine”. IPTEK The Journal for Technology and Science 30 (2):56-59. https://doi.org/10.12962/j20882033.v30i2.4341.