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Pilawa-Podgurski, <i>et al<\/i>.: \u201cVery-high-frequency resonant boost converters,\u201d IEEE Trans. Power Electron. <b>24<\/b> (2009) 1654 (DOI: 10.1109\/TPEL.2009.2016098)."},{"key":"2","unstructured":"[2] Z.-L. Zhang, <i>et al<\/i>.: \u201cA digital adaptive driving scheme for eGaN HEMTs in VHF converters,\u201d IEEE Trans. Power Electron. <b>32<\/b> (2017) 6197 (DOI: 10.1109\/TPEL.2016.2619911)."},{"key":"3","unstructured":"[3] Z. Zhang and K.D.T. Ngo: \u201cMulti-megahertz quasi-square-wave flyback converter using eGaN FETs,\u201d IET Power Electron. <b>10<\/b> (2017) 1138 (DOI: 10.1049\/iet-pel.2016.0782)."},{"key":"4","unstructured":"[4] Z. Zhang, <i>et al<\/i>.: \u201cGaN VHF converters with integrated air-core transformers,\u201d IEEE Trans. Power Electron. <b>34<\/b> (2019) 3504 (DOI: 10.1109\/TPEL.2018.2849063)."},{"key":"5","unstructured":"[5] X. 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