Resume
This work is cataloged in the Scientific Portal. Officially published in Investigaciones de Economía de la Educacion (2019). Referenced as: "Moreira, José Joaquim; Pinto, Ana Paula (D718-2A43-7510); Oliveira, Carlos Miguel (7B1B-11A7-8EB1); Godinho, António (D11F-CF93-483A); Teixeira, Manuel Pinto".