@ARTICLE
        { NRjea08,
          TITLE = "Dynamic Spatial Approximation Trees",
          AUTHOR = "G. Navarro and N. Reyes",
          JOURNAL = "ACM Journal of Experimental Algorithmics (JEA)",
	  YEAR = 2008,
	  VOLUME = "12",
	  PAGES = "article 1.5",
	  NOTE = "68 pages"
        }