Max Lungarella Fumiya Iida Josh C. Bongard Rolf Pfeifer AI in the 21<sup>st</sup> Century - With Historical Reflections. 1-8 2006 conf/ai50/2006 50 Years of Artificial Intelligence http://dx.doi.org/10.1007/978-3-540-77296-5_1 db/conf/ai50/ai502006.html#LungarellaIBP06