@conference {14547,
	title = {Improved lower and upper bounds for universal TSP in planar metrics},
	booktitle = {Proceedings of the seventeenth annual ACM-SIAM symposium on Discrete algorithm},
	year = {2006},
	month = {2006///},
	pages = {649 - 658},
	author = {Hajiaghayi, Mohammad T. and Kleinberg,R. and Leighton,T.}
}
