@ARTICLE {
        BCNic13,
	AUTHOR = "J. Barbay and F. Claude and G. Navarro",
	TITLE = "Compact Binary Relation Representations with Rich 
		 Functionality",
        JOURNAL = "Information and Computation",
        PUBLISHER = "Elsevier",
	YEAR = 2013,
	VOLUME = 232,
	PAGES = "19--37"
        }