Keisuke Inoue Mineo Kaneko Tsuyoshi Iwagaki Optimal Register Assignment with Minimum-Path Delay Compensation for Variation-Aware Datapaths. 1096-1105 2009 92-A IEICE Transactions 4 http://search.ieice.org/bin/summary.php?id=e92-a_4_1096&category=A&year=2009&lang=E&abst= db/journals/ieicet/ieicet92a.html#InoueKI09