1. Department of Engineering Cybernetics; Norwegian University of Science and Technology; O. S. Bragstads plass 2D 7491 Trondheim Norway
2. SINTEF ICT Applied Cybernetics; PO Box 4760 Sluppen 7465 Trondheim Norway
3. CNRS-L2S; Supélec; 3 rue Joliot-Curie 91192 Gif sur Yvette France
4. Université Paris-Sud 11 - L2S - EECI - Supélec; 3 rue Joliot-Curie 91192 Gif sur Yvette France