Carsten Gutwenger Michael Jünger Sebastian Leipert Petra Mutzel Merijam Percan René Weiskircher Advances in C-Planarity Testing of Clustered Graphs. 220-235 2002 conf/gd/2002 Graph Drawing http://link.springer.de/link/service/series/0558/bibs/2528/25280220.htm db/conf/gd/gd2002.html#GutwengerJLMPW02