Eugene Inseok Chong Souripriya Das George Eadon Jagannathan Srinivasan An Efficient SQL-based RDF Querying Scheme. 1216-1227 2005 conf/vldb/2005 VLDB http://www.vldb2005.org/program/paper/fri/p1216-chong.pdf db/conf/vldb/vldb2005.html#ChongDES05