1. Department of Computer Science and Applied Mathematics, Weizmann Institute of Science, Rehovot, Israel
2. Department of Environmental Engineering, São Paulo State University, São José dos Campos, Brazil
3. Department of Statistics, University of Campinas, Campinas, Brazil
4. LISTIC - Polytech Annecy-Chambéry, Université de Savoie, Annecy le Vieux Cedex, France