@conference {OA2003,
	title = {Behavior of the Series Resonant Energy Converter at Frequencies Differing from the Resonant One},
	booktitle = {The Day of the Radio Conference},
	year = {1988},
	month = {May},
	url = {http://oa.uninova.pt/2003/},
	author = {Stanimir Valtchev and Georgi Krustev}
}
