1. Department of Mathematics, Namangan State University, Namangan 116019, Uzbekistan
2. V.I.Romanovskiy Institute of Mathematics, Uzbekistan Academy of Sciences, Tashkent 100174, Uzbekistan
3. Department of General and Exact Subjects, Tashkent State University of Economics, Tashkent 100006, Uzbekistan
4. Faculty of Physics-Mathematics, Andijan State University, Andijon 170100, Uzbekistan
5. Department of Law, Economics and Human Sciences, University Mediterranea of Reggio Calabria, 89124 Reggio Calabria, Italy
6. ICRIOS—The Invernizzi Centre for Research in Innovation, Organization, Strategy and Entrepreneurship, Department of Management and Technology, Bocconi University, 20100 Milano, Italy