Zohreh Karimi Majid Sarrafzadeh Fine-grained post placement voltage assignment considering level shifter overhead. 73-78 2010 VLSI-SoC http://dx.doi.org/10.1109/VLSISOC.2010.5642618 conf/vlsi/2010soc db/conf/vlsi/vlsisoc2010.html#KarimiS10