Hao Xu Wen-Ben Jone Ranga Vemuri Accurate energy breakeven time estimation for run-time power gating. 161-168 2008 ICCAD http://doi.acm.org/10.1145/1509456.1509501 conf/iccad/2008 db/conf/iccad/iccad2008.html#XuJV08