Wojciech Maly Yi-Wei Lin Malgorzata Marek-Sadowska OPC-Free and Minimally Irregular IC Design Style. 954-957 2007 conf/dac/2007 DAC http://doi.ieeecomputersociety.org/10.1109/DAC.2007.375302 db/conf/dac/dac2007.html#MalyLM07