Stylianos Stratantonakis, Economist, Master in Sustainable Development, Harokopio University, Email:
Roido Mitoula, Professor, Harokopio University of Athens, Email:
Helen Theodoropoulou, Professor, Harokopio University of Athens,
Panagiotis Kaldis, Professor University of Western Attica, Email:
DOI: 10.26341/issn.2241-4002-2019-1a-6