@ARTICLE {
	AUTHOR = "Edgar Ch{\'a}vez and Gonzalo Navarro",
	TITLE ="Fundamentals of the Problem",
	JOURNAL = "SIGSPATIAL Special",
	VOLUME = "2",
	NUMBER = "2",
	PAGES = "2-7",
	MONTH = "Jul",
	YEAR = "2010",
	PUBLISHER = "ACM Press",
	ADDRESS = "New York, NY, USA",
	ISSN = "1946-7729"
	}