1. Department of Mathematics, Indian Institute of Engineering Science and Technology, Shibpur, Kolkata 711103, India
2. Doctoral School of Economic and Regional Sciences, Hungarian University of Agriculture and Life Sciences, 2100 Godollo, Hungary
3. Business Management and Marketing Department, School of Business and Economics, Westminster International University in Tashkent (WIUT), Tashkent 100047, Uzbekistan
4. Department of Mathematics, Sonarpur Mahavidyalaya, Rajpur, Kolkata 700149, India
5. Hungarian National Bank—Research Center, John Von Neumann University, 6000 Kecskemét, Hungary