1. Department of Mathematical and Informatics Sciences, Physical Sciences and Earth Sciences, University of Messina, Messina, Italy;
2. CISFA, Interuniversity Consortium of Applied Physical Sciences, Messina, Italy;
3. Le Studium, Loire Valley Institute for Advanced Studies, Orléans, France;
4. Centre de Biophysique Moleculaire (CBM), CNRS UPR 4301 du CNRS, Orleans CEDEX 2, France;
5. Laboratoire Interfaces, Confinement, Matériaux et Nanostructures (ICMN), UMR 7374 CNRS, Université d’Orléans, Orléans cedex 2, France;
6. Istituto Nazionale di Alta Matematica “F. Severi” – INDAM, Gruppo Nazionale per la Fisica Matematica – GNFM, Rome, Italy