Boris Axelrod Yefim Berkovich Adrian Ioinovici Transformerless DC-DC Converters With A Very High DC Line-To-Load Voltage Ratio. 467-475 2004 13 Journal of Circuits, Systems, and Computers 3 http://dx.doi.org/10.1142/S0218126604001556 db/journals/jcsc/jcsc13.html#AxelrodBI04