1. ISI Foundation , via Chisola 5, 10126 Torino , Italy
2. Department of Applied Mathematics and Computer Science, DTU, Richard Petersens Plads , DK-2800 Copenhagen , Denmark
3. Department of Sociology and Social Research, University of Trento , via Verdi 26 , I-38122 Trento, Italy
4. UMR 215 PRODIG, Institute for Research on Sustainable Development - IRD , 5 cours des Humanités , F-93 322 Aubervilliers Cedex, France {C}%3C!%2D%2D%7C%7CrmComment%7C%7C%3C~show%20%5BAQ%20ID%3DAQ1%5D~%3E%2D%2D%3E