University of Pitesti, University of Regensburg, Hanoi Law University; Hanoi (R.S Vietnam),, Hanoi Law University; Hanoi (R.S Vietnam),, Nicolae Titulescu University, Ecological University of Bucharest, Ecological University of Bucharest, National School of Political and Administrative Studies, University of Pitesti, Faculty of Juridical and Administrative Sciences, University of Pitesti - Faculty of Economic Sciences and University of Pitesti