Watanakul, N., S. Pattanasethanon, and A. Aurasopon. “Stand-Alone Photovoltaic-Based Reduction of Harmonic Current Using a 12-Pulse AC/DC Power Conversion System With Trapezoidal Voltage Waveform”. Science & Technology Asia, vol. 15, no. 2, Oct. 2015, pp. 28-42, https://ph02.tci-thaijo.org/index.php/SciTechAsia/article/view/41290.