Sourav S. Bhowmick Josef Küng Roland Wagner Database and Expert Systems Applications, 20th International Conference, DEXA 2009, Linz, Austria, August 31 - September 4, 2009. Proceedings 5690 2009 http.//dx.doi.org/10.1007/978-3-642-03573-9 978-3-642-03572-2 DEXA Lecture Notes in Computer Science Springer db/conf/dexa/dexa2009.html