1. Doctoral School of Economic and Regional Sciences, Hungarian University of Agriculture and Life Sciences (MATE), H-2100 Gödöllő, Hungary
2. California Language Academy, Jalan Ampang, Kuala Lampur City Center, Kuala Lampur 50450, Malaysia
3. Department of Mathematical Science, Sharif University of Technology, Tehran 1458889694, Iran
4. Department of Agricultural Logistics, Trade and Marketing, Institute of Agricultural and Food Economics, Hungarian University of Agriculture and Life Sciences (MATE), Páter Károly Street 1, H-2100 Gödöllő, Hungary
5. Institute of Agricultural and Food Economics, Hungarian University of Agriculture and Life Sciences (MATE), Páter Károly Street 1, H-2100 Gödöllő, Hungary