González-Enríquez, Carmen, and Jose Pablo Martínez Romera. “Spanish High Qualified Migration After the Crisis. A Comparison With Italian, Greek and Portuguese High Qualified Migrations”. Migraciones. Publicación Del Instituto Universitario De Estudios Sobre Migraciones, no. 43, Dec. 2017, pp. 117-45, https://doi.org/10.14422/mig.i43.y2017.006.