khuttiyaboot, S., and N. Leeprechanon. “A Harmonics Suppression Technique in Neutral Conductor for Three-Phase-Four-Wire Distribution Systems”. Science & Technology Asia, vol. 19, no. 3, Sept. 2014, pp. 66-75, https://ph02.tci-thaijo.org/index.php/SciTechAsia/article/view/21441.