Automatic Identification of Learners’ Language Background Based on Their Writing in Czech Katsiaryna Aharodnik author Marco Chang author Anna Feldman author Jirka Hana author 2013-10 text Proceedings of the Sixth International Joint Conference on Natural Language Processing Ruslan Mitkov editor Jong C Park editor Asian Federation of Natural Language Processing Nagoya, Japan conference publication aharodnik-etal-2013-automatic https://aclanthology.org/I13-1200/ 2013-10 1428 1436