Qualitative and Quantitative Practical Reasoning : First International Joint Conference on Qualitative and Quantitative Practical Reasoning, ECSQARU-FAPR'97, Bad Honnef, Germany, June 9-12, 1997 Proceedings - Dov M. Gabbay, Rudolf Kruse, Andreas Nonnengart, Hans Jürgen Ohlbach ((Lecture Notes in Computer Science))