Heinrich C. Mayr Jirí Lazanský Gerald Quirchmayr Pavel Vogel Database and Expert Systems Applications, 12th International Conference, DEXA 2001 Munich, Germany, September 3-5, 2001, Proceedings DEXA Lecture Notes in Computer Science 2113 Springer 2001 3-540-42527-6 db/conf/dexa/dexa2001.html