Jacob R. Minz Xin Zhao Sung Kyu Lim Buffered clock tree synthesis for 3D ICs under thermal variations. 504-509 2008 ASP-DAC http://dx.doi.org/10.1109/ASPDAC.2008.4484003 conf/aspdac/2008 db/conf/aspdac/aspdac2008.html#MinzZL08