1. Faculty of Economics and Business Administration, Babeş-Bolyai University, Cluj-Napoca, Romania
2. Faculty of Economic Science, 1 Decembrie 1918 University, Alba Iulia, Romania
3. Institut of Multidisciplinary Research for Science and Tehnology, Valahia University of Targoviște, Targoviste, Romania
4. Faculty of Economics and Business, University of Murcia, Spain