LXPER Index 2.0: Improving Text Readability Assessment Model for L2 English Students in Korea Bruce W Lee author Jason Lee author 2020-12 text Proceedings of the 6th Workshop on Natural Language Processing Techniques for Educational Applications Erhong YANG editor Endong XUN editor Baolin ZHANG editor Gaoqi RAO editor Association for Computational Linguistics Suzhou, China conference publication lee-lee-2020-lxper 10.18653/v1/2020.nlptea-1.3 https://aclanthology.org/2020.nlptea-1.3/ 2020-12 20 24