Chih-Wei Jim Chang Ming-Fu Hsiao Bo Hu Kai Wang Malgorzata Marek-Sadowska Chung-Kuan Cheng Sao-Jie Chen Fast postplacement optimization using functional symmetries. 102-118 2004 23 IEEE Trans. on CAD of Integrated Circuits and Systems 1 http://doi.ieeecomputersociety.org/10.1109/TCAD.2003.819904 db/journals/tcad/tcad23.html#ChangHHWMCC04