Note: A zipped up postscript version of this paper is also available.
Pieter J. Mosterman
Institute of Robotics and System Dynamics
German Aerospace Establishment
D-82230 Wessling
Germany
Pieter.J.Mosterman@dlr.de
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Gautam Biswas
Center for Intelligent Systems
Vanderbilt University
Nashville, TN 37235
U.S.A.
biswas@vuse.vanderbilt.edu