Progress in Artificial Intelligence: Knowledge Extraction, Multi-agent Systems, Logic Programming, and Constraint Solving 10th Portuguese Conference on Artificial Intelligence, EPIA 2001, Porto, Portugal, December 17-20, 2001. Proceedings - Brazdil, Pavel; Brazdil, Pavel; Jorge, Alipio; Jorge, Alipio (Springer Berlin Heidelberg : Imprint: Springer, 2001)