@inproceedings{STOC-2006-Klein,
	author        = "Philip N. Klein",
	booktitle     = "{Proceedings of the 38th Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/1132516.1132620",
	isbn          = "1-59593-134-1",
	pages         = "749--756",
	publisher     = "{ACM}",
	title         = "{A subset spanner for Planar graphs, : with application to subset TSP}",
	year          = 2006,
}