Hamed Abrishami Safar Hatami Behnam Amelifard Massoud Pedram NBTI-aware flip-flop characterization and design. 29-34 2008 ACM Great Lakes Symposium on VLSI http://doi.acm.org/10.1145/1366110.1366121 conf/glvlsi/2008 db/conf/glvlsi/glvlsi2008.html#AbrishamiHAP08