S. Arumugam and S. Reddy, “A Noval Comparison of Class D and Class E Inverter Based High Frequency Application”, The Annals of “Dunarea de Jos“ University of Galati. Fascicle III, Electrotechnics, Electronics, Automatic Control, Informatics, vol. 34, no. 2, pp. 29-35, Dec. 2011.