Yangjae Lee, Dongmin Yang, Taek-Young Youn and Ki-Woong Park 2018. Authorized Wireless Charging System based on Double-Frequency-Hopping for Mobile Devices. Research Briefs on Information and Communication Technology Evolution . 4, (Sep. 2018), 86–97. DOI:https://doi.org/10.56801/rebicte.v4i.69.