lae Kim, Jeong, and Kyu dong Kim. “Certification of the Rough Resonance by the Wave Site of Matter for Welter Point on the Alteration Recognition System”. International Journal of Engineering & Technology, vol. 7, no. 3.33, Aug. 2018, pp. 98-101, https://doi.org/10.14419/ijet.v7i3.33.18583.