Institution: | 1. Politecnico di Milano, Dipartimento di Matematica “F. Brioschi”, Via Bonardi 9, I-20133 Milano, Italy;2. Università di Modena e Reggio Emilia, Dipartimento di Matematica, Via Campi 213/B, I-41125 Modena, Italy;3. Université de Poitiers, Laboratoire de Mathématiques et Applications, UMR CNRS 7348 - SP2MI, Boulevard Marie et Pierre Curie - Téléport 2, F-86962 Chasseneuil Futuroscope Cedex, France;1. Pusan National University, Mathematics Department, Busan, 609-735, Republic of Korea;2. Iowa State University, Mathematics Department, Ames, IA 50011, United States |