1. P.E. Agre and D. Chapman, Unpublished memo, MIT Artificial Intelligence Laboratory, Cambridge, MA (1986).
2. Systematic understanding: synthesis, analysis, and contingent knowledge in specialized understanding systems;Bobrow,1975
3. A robust layered control system for a mobile robot;Brooks;IEEE J. Rob. Autom.,1986
4. A hardware retargetable distributed layered architecture for mobile robot control;Brooks,1987
5. Asynchronous distributed control system for a mobile robot;Brooks,1986