G. Sakulphaisan, N. Junhuathon. “THE SUITABLE SIZE AND PLACEMENT OF AC TRACTION SUBSTATION FOR HIGH-SPEED TRAIN IN THAILAND ”. International Journal of Advanced Science and Technology, Vol. 29, no. 6s, Apr. 2020, pp. 616 -26, http://sersc.org/journals/index.php/IJAST/article/view/8882.