1. Department of Digital Economics and Agrotechnologies, University of Digital Economics and Agrotechnologies, Tashkent 100022, Uzbekistan
2. Faculty of Science, Universiti Putra Malaysia, Serdang, Selangor, Malaysia, & Department of Higher Mathematics, Tashkent Finance Institute, Tashkent, Uzbekistan
3. Department of Mathematics and Institute for Mathematical Research, Universiti Putra Malaysia, Serdang, Malaysia
4. School of Public Finance and Taxation, Zhejiang University of Finance and Economics, Hangzhou 310018, China