@ARTICLE {
        NavACMcs14,
        TITLE = "Spaces, Trees and Colors: The Algorithmic Landscape of 
		 Document Retrieval on Sequences",
        AUTHOR = "G. Navarro",
        JOURNAL = {ACM Computing Surveys},
        YEAR = 2014,
	VOLUME = 46,
	NUMBER = 4,
	PAGES = "article 52",
	NOTE = "47 pages"
        }