Symposium on the Design and Implementation of Large Spatial Databases.Symposium on the Design and Implementation of Large Spatial Databases(2nd : 1991 : Switzerland)：Advances in spatial databases.Spinger,1991.
J. E. Pin,LITP Spring School on theoratical Computer Science.LITP Spring School on theoretical Computer Science(1988 : France)：Formal properties of finite automata and applications.Spinger-Verlag,1989.
