Assessment of an Index for Measuring Pronunciation Difficulty Katsunori Kotani author Takehiko Yoshimi author 2018-07 text Proceedings of the 5th Workshop on Natural Language Processing Techniques for Educational Applications Yuen-Hsien Tseng editor Hsin-Hsi Chen editor Vincent Ng editor Mamoru Komachi editor Association for Computational Linguistics Melbourne, Australia conference publication kotani-yoshimi-2018-assessment 10.18653/v1/W18-3717 https://aclanthology.org/W18-3717/ 2018-07 119 124