Fernando Galindo Makoto Takizawa Roland Traunmüller Database and Expert Systems Applications, 15th International Conference, DEXA 2004 Zaragoza, Spain, August 30-September 3, 2004, Proceedings DEXA Lecture Notes in Computer Science 3180 Springer 2004 3-540-22936-1 db/conf/dexa/dexa2004.html