Partitioning planar graphs with costs and weights.

Lyudmil Aleksandrov Hristo Djidjev Hua Guo Anil Maheshwari Partitioning planar graphs with costs and weights. 2006 11 ACM Journal of Experimental Algorithmics http://doi.acm.org/10.1145/1187436.1210588 db/journals/jea/jea11.html#AleksandrovDGM06