Preface to this special issue
-
1.
Dipartimento di Matematica, Università di Bari "Aldo Moro", Via E. Orabona 4, 70125 Bari, Italy
-
2.
Department of Mathematical, Physical and Computer Sciences, University of Parma, Viale Parco Area delle Scienze 53/A, I-43124 PARMA, Italy
-
3.
Laboratoire de Mathématiques et Applications, UMR CNRS 7348, Université de Poitiers, SP2MI, Boulevard Marie et Pierre Curie - Téléport 2, 86962 Chasseneuil Futuroscope Cedex, France