@conference {OA2007,
	title = {Some Regulation Characteristics of Pulse?Width Modulated Series Resonant Power Conversion},
	booktitle = {6th Conference on Power Electronics and Motion Control PEMC{\textquoteright}90},
	year = {1990},
	month = {October},
	pages = {83{\textendash}87},
	url = {http://oa.uninova.pt/2007/},
	author = {Stanimir Valtchev}
}
