Predicting the Difficulty of Language Proficiency Tests Lisa Beinborn author Torsten Zesch author Iryna Gurevych author 2014 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal beinborn-etal-2014-predicting 10.1162/tacl_a_00200 https://aclanthology.org/Q14-1040/ 2014 2 517 530