@ARTICLE {
	AUTHOR = "Jaime S{\'a}nchez and Mauricio S{\'a}enz",
	TITLE ="Metro Navigation for the Blind",
	JOURNAL = "Computers and Education (CAE)",
	VOLUME = "55",
	NUMBER = "3",
	PAGES = "970-981",
	MONTH = "Jul",
	YEAR = "2010",
	PUBLISHER = "Elsevier Science",
	ADDRESS = "Amsterdam, The Netherlands",
	ISSN = "0360-1315"
	}