Xiren Wang Wenjian Yu Zeyi Wang A New Boundary Element Method for Multiple-Frequency Parameter Extraction of Lossy Substrates. 62-67 2007 conf/aspdac/2007 ASP-DAC http://doi.ieeecomputersociety.org/10.1109/ASPDAC.2007.357793 db/conf/aspdac/aspdac2007.html#WangYW07