Chieh Changfan Yu-Chin Hsu Fur-Shing Tsai Timing optimization on routed designs with incremental placementand routing characterization. 188-196 2000 19 IEEE Trans. on CAD of Integrated Circuits and Systems 2 http://doi.ieeecomputersociety.org/10.1109/43.828547 db/journals/tcad/tcad19.html#ChangfanHT00