1. Department of Economics and Economic Policy, Faculty of Theoretical and Applied Economics, Bucharest University of Economic Studies, Bucharest, Romania
2. Department of Economics and Business Administration, Faculty of Economics, “Constantin Brâncuși” University of Târgu-Jiu, Târgu-Jiu, Gorj, Romania
3. Department of Statistics and Econometrics, Faculty of Economic Cybernetics, Statistics and Informatics, Bucharest University of Economic Studies, Bucharest, Romania