Jeegar Tilak Shah Marius Evers Jeff Trull Alper Halbutogullari Circuit optimization for leakage power reduction using multi-threshold voltages for high performance microprocessors. 67-74 2007 conf/ispd/2007 ISPD http://doi.acm.org/10.1145/1231996.1232010 db/conf/ispd/ispd2007.html#ShahETH07