Iglesias Sánchez, Sara. “Points Based Systems and the Blue Card Directive: Concurrence and Complementarity in the Regulation of Highly Skilled Migration in the European Union”. Migraciones. Publicación del Instituto Universitario de Estudios sobre Migraciones, no. 28 (December 17, 2013): 157–191. Accessed March 13, 2026. https://revistas.comillas.edu/revistamigraciones/article/view/1261.