21 Feb 2003:
C-Planarity of Clustered Graphs
I'll introduce the concepts, the open problem, and the
progress that have been made. I'll touch some technical details in 
- Feng, Eades and Cohen, Clustered Graphs and C-planarity, Euro. Sym.
on Alg. 1995.
- Dahlhaus, Linear time algorithms to recognize clustered planar
graphs and its parallelization, LATIN'98.
- Duncan, Goodrich, and Kobourov, Planarity-Preserving Clustering and
Embedding for Large Planar Graphs, Graph Drawing 1999.
- Battista, Walter Didimo and Marcandalli, Planarization of Clustered
Graphs, Graph Drawing 2001.
- Gutwenger et al., Advances in C-Planarity Testing of Clustered Graphs, Graph Drawing