1. Electrical Engineering Department, Centro Universitário da FEI, São Paulo, Brazil
2. College of Science and Engineering, Flinders University, Adelaide, Australia
3. CITIC Research Center, University of A Coruña, A Coruña, Spain
4. Institut Jean Nicod, Ecole Normale Supérieure, Paris, France
5. Ecole des Hautes Etudes en Sciences Sociales, Paris, France