Jürgen Dix Luis Fariñas del Cerro Ulrich Furbach Logics in Artificial Intelligence, European Workshop, JELIA '98, Dagstuhl, Germany, October 12-15, 1998, Proceedings JELIA Lecture Notes in Computer Science 1489 Springer 1998 3-540-65141-1 db/conf/jelia/jelia98.html