Suechoey, Boonlert, Panya Maleewat, and Vichai Saelee. 2021. “INSTRUMENT OF VOLTAGE RATIO AND CHECK OF PHASE DISPLACEMENT”. Srinakharinwirot University Journal of Sciences and Technology 13 (26, July-December):48-59. https://ph02.tci-thaijo.org/index.php/swujournal/article/view/246228.