Dunisha Wijeratne Gerry Moschopoulos Quadratic Power Conversion for Power Electronics: Principles and Circuits. 426-438 2012 59-I IEEE Trans. on Circuits and Systems 2 http://dx.doi.org/10.1109/TCSI.2011.2163976 db/journals/tcas/tcasI59.html#WijeratneM12