Hans Jürgen Ohlbach Sebastian Schaffert Principles and Practice of Semantic Web Reasoning, Second International Workshop, PPSWR 2004, St. Malo, France, September 6-10, 2004, Proceedings PPSWR Lecture Notes in Computer Science 3208 Springer 2004 3-540-22961-2 db/conf/ppswr/ppswr2004.html