Zarco-Tejada, Ángeles, C. Noya Gallardo, M. C. Merino Ferradá, and I. Calderón López. “Analysing Corpus-Based Criterial Conjunctions for Automatic Proficiency Classification”. Journal of English Studies, vol. 14, Dec. 2016, pp. 215-37, doi:10.18172/jes.3090.