Engines of the Skill Premium in the Portuguese Economy M.C. Nogueira O. Afonso Publication Journal: CESifo Economic Studies Year of Publication: 2019 Volume: 65 Issue: 3 Pagination: 318-341 Identifiers ISSN: 16127501 1610241X Other Numbers: 2-s2.0-85072764883 Alternative titles DOIGoogle ScholarBibTeXRIS Locators