1. School of Engineering, Central Asian University, Milliy Bog St 264, Tashkent 111221, Uzbekistan
2. Faculty of Mathematics, University of Vienna, Oskar-Morgenstern Platz 1, 1090 Vienna, Austria
3. V.I.Romanovskiy Institute of Mathematics, Uzbekistan Academy of Sciences, Tashkent 100174, Uzbekistan
4. Department of Applied Mathematics, Tashkent State University of Economics, Tashkent 100006, Uzbekistan
5. Department of Mathematics, New Uzbekistan University, Mustaqillik ave.54, Tashkent 100007, Uzbekistan
6. Department of Mathematics and Information Technologies, Fiscal Institute under the Tax Committee, Tashkent 100173, Uzbekistan
7. Department of Law, Economics and Human Sciences, University Mediterranea of Reggio Calabria, 89124 Reggio Calabria, Italy