1. Center for Research and Development in Mathematics and Applications, Department of Economics, Management, Industrial Engineering and Tourism, University of Aveiro, Aveiro, Portugal
2. Institute of Electronics and Informatics Engineering of Aveiro / Research Unit on Governance, Competitiveness and Public Policies, Department of Economics, Management, Industrial Engineering and Tourism, University of Aveiro, Aveiro, Portugal
3. Research Unit on Governance, Competitiveness and Public Policies, Department of Economics, Management, Industrial Engineering and Tourism, University of Aveiro, Aveiro, Portugal