François Bry Raghu Ramakrishnan Kotagiri Ramamohanarao Deductive and Object-Oriented Databases, 5th International Conference, DOOD'97, Montreux, Switzerland, December 8-12, 1997, Proceedings DOOD Lecture Notes in Computer Science 1341 Springer 1997 3-540-63792-3 db/conf/dood/dood97.html