Luís Guerra e Silva Zhenhai Zhu Joel R. Phillips L. Miguel Silveira Variation-Aware, Library Compatible Delay Modeling Strategy. 122-127 2006 conf/vlsi/2006soc VLSI-SoC http://dx.doi.org/10.1109/VLSISOC.2006.313215 db/conf/vlsi/vlsisoc2006.html#SilvaZPS06