Yuichi Tanji Takayuki Watanabe Hideki Asai Generating stable and sparse reluctance/inductance matrix under insufficient conditions. 164-169 2008 ASP-DAC http://dx.doi.org/10.1109/ASPDAC.2008.4483932 conf/aspdac/2008 db/conf/aspdac/aspdac2008.html#TanjiWA08