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D. Bonheure, D. De-mathématique-di-bari, D. Di-meccanica, . Matematica-e-management, and E. Via, Boulevard du Triomphe, B-1050 Bruxelles, Belgium, and INRIA ? Team MEPHYSTO. E-mail address: denis.bonheure@ulb.ac.be Silvia Cingolani Orabona 4, 70125 Bari, Italy E-mail address: silvia.cingolani@poliba.it Jean Van Schaftingen, 1348.