1. Université de Nantes & LS2N UMR CNRS 6004, Nantes, France;
2. GEMTEX Laboratory, Ecole Nationale Supérieure des Arts et Industries Textiles, Roubaix, France;
3. Università di Catania, Catania, Italy;
4. Department of Statistics & Actuarial-Financial Mathematics, University of Aegean, Karlovasi, Greece;
5. Department of Business Administration, University of Piraeus, Piraeus, Greece