Timos K. Sellis Renée J. Miller Anastasios Kementsietsidis Yannis Velegrakis Proceedings of the ACM SIGMOD International Conference on Management of Data, SIGMOD 2011, Athens, Greece, June 12-16, 2011 SIGMOD Conference ACM 2011 978-1-4503-0661-4 db/conf/sigmod/sigmod2011.html