Liu Dawei Qiang Zhou Jinian Bian Yici Cai Xianlong Hong Cell shifting aware of wirelength and overlap. 506-510 2009 ISQED http://dx.doi.org/10.1109/ISQED.2009.4810346 conf/isqed/2009 db/conf/isqed/isqed2009.html#DaweiZBCH09