1. Department of Economics, Administration and Sociology University of São Paulo Piracicaba Brazil
2. Instituto Politécnico de Beja Beja Portugal
3. CIMA – Center for Research on Mathematics and Its Applications University of Évora Évora Portugal
4. CMA‐Center of Mathematics and Applications NFCTNOVA, NOVA University of Lisbon Lisbon Portugal
5. VALORIZA—Research Center for Endogenous Resource Valorization Portalegre Portugal
6. Instituto Politécnico de Portalegre Portalegre Portugal
7. CEFAGE‐UE, IIFA, Universidade de Évora Évora Portugal