1. Brooks RA (1991) Intelligence without reason. A.I. Memo, ftp'able at httpp://www.ai.mit.edu/ 1293, MIT AI Laboratory
2. Steels L (1993) Building agents out of autonomous behavior systems. In: Steels L, Brooks RA (eds)The “artificial life” route to “artificial intelligence”: building situated embodied agents. Lawrence Erlbaum
3. Pfeifer R, Scheier Ch (1997)An introduction to new artificial intelligence. MIT Press, Cambridge, in press
4. Brooks R (1986) A robust layered control system for a mobile robot. IEEE J Robotics Autom 2:14–23
5. Baerends GP (1975) On drive, conflict and instinct, and the functional organization of behavior. In: Corner MA, Swaab DF (eds)Perspectives in brain research. Proceedings of the 9th International Summer School of Brain Research, Amsterdam, August 1975. Elsevier, Amsterdam, pp. 427–447