@ARTICLE {
	AUTHOR = "Claudio Gutierrez and Carlos Hurtado and Alberto Mendelzon and Jorge P{\'e}rez",
	TITLE ="Foundations of Semantic Web Databases",
	JOURNAL = "Journal of Computer and System Sciences (JCSS)",
	VOLUME = "77",
	PAGES = "520-541",
	YEAR = "2011",
	PUBLISHER = "Elsevier Science",
	ADDRESS = "Amsterdam, The Netherlands",
	ISSN = "0022-0000"
	}