Scott Hanson Mingoo Seok Dennis Sylvester David Blaauw Nanometer Device Scaling in Subthreshold Circuits. 700-705 2007 conf/dac/2007 DAC http://doi.ieeecomputersociety.org/10.1109/DAC.2007.375254 db/conf/dac/dac2007.html#HansonSSB07