Shinichi Murai Hiroo Tsuji Morio Kakinuma Kazumichi Sakaguchi Chiyoji Tanaka A hierarchical placement procedure with a simple blocking scheme. 18-23 1979 DAC http://dl.acm.org/citation.cfm?id=811685 conf/dac/1979 db/conf/dac/dac1979.html#MuraiTKST79