AUTHOR=de Bruin Angela , Carreiras Manuel , Duñabeitia Jon Andoni TITLE=The BEST Dataset of Language Proficiency JOURNAL=Frontiers in Psychology VOLUME=8 YEAR=2017 URL=https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2017.00522 DOI=10.3389/fpsyg.2017.00522 ISSN=1664-1078