| Affiliation: | 1. BORDA Research Unit and Multidisciplinary Institute of Enterprise (IME), Universidad de Salamanca, 37007 Salamanca, Spain;2. Department of Economics and Business, Universidad de Almería, 04120 Almería, Spain;1. Department of Mathematics, Hazara University, Mansehra, Pakistan;2. Department of Mathematics, COMSATS Institute of Information Technology, Abbottabad, Pakistan;3. Department of Mathematics, College of Science Al-Zulfi, Majmaah University, Al-Zulfi, Saudi Arabia;1. CAS Key Laboratory of Technology in Geo-spatial Information Processing and Application Systems, University of Science and Technology of China, Hefei, China;2. USTC-Birmingham Joint Research Institute in Intelligent Computation and Its Applications (UBRI), University of Science and Technology of China, Hefei, China |
