Ngaemngam, Surin, Nut Thangpreecharparnich, Theerapol Muankhaw, Suttee Tubtongdee, Kananake Toomkaew, and Prawee Phuin. 2021. “Prepaid Electric Energy Consumption System via Online Top-Up System and a Notification Through LINE Application”. Journal of Engineering, RMUTT 19 (2):43-52. https://ph01.tci-thaijo.org/index.php/jermutt/article/view/244438.