Tan Yan Shuting Li Yasuhiro Takashima H. Murata A Theoretical Study on Wire Length Estimation Algorithms for Placement with Opaque Blocks. 268-273 2007 conf/aspdac/2007 ASP-DAC http://doi.ieeecomputersociety.org/10.1109/ASPDAC.2007.357997 db/conf/aspdac/aspdac2007.html#YanLTM07