Stephan Eidenbenz Christoph Stamm MAXIMUM CLIQUE and MINIMUM CLIQUE PARTITION in Visibility Graphs. 200-212 http://link.springer.de/link/service/series/0558/bibs/1872/18720200.htm 2000 conf/ifipTCS/2000 IFIP TCS db/conf/ifipTCS/ifipTCS2000.html#EidenbenzS00