Automatic CEFR Level Prediction for Estonian Learner Text Sowmya Vajjala author Kaidi Lõo author 2014-11 text Proceedings of the third workshop on NLP for computer-assisted language learning Elena Volodina editor Lars Borin editor Ildikó Pilán editor LiU Electronic Press Uppsala, Sweden conference publication vajjala-loo-2014-automatic https://aclanthology.org/W14-3509/ 2014-11 113 127