@ARTICLE {
        CNsigspatial10,
        TITLE = "Fundamentals of the Problem",
        AUTHOR = "E. Ch{\'a}vez and G. Navarro",
        JOURNAL = "ACM SIGSPATIAL Special",
        YEAR = 2010,
	VOLUME = 2,
	NUMBER = 2,
	PAGES = "2--7"
        }