Ashari, Mochamad. “Converter Ac-to-Ac With Additional Free- Wheeling Switches for Improving Power Factor and Reducing Harmonic Distortion”. IPTEK The Journal for Technology and Science, vol. 19, no. 2, June 2025, pp. 35-40, https://journal.its.ac.id/index.php/jts/article/view/5908.