@inproceedings{kotani-yoshimi-2018-assessment,
    title = "Assessment of an Index for Measuring Pronunciation Difficulty",
    author = "Kotani, Katsunori  and
      Yoshimi, Takehiko",
    editor = "Tseng, Yuen-Hsien  and
      Chen, Hsin-Hsi  and
      Ng, Vincent  and
      Komachi, Mamoru",
    booktitle = "Proceedings of the 5th Workshop on Natural Language Processing Techniques for Educational Applications",
    month = jul,
    year = "2018",
    address = "Melbourne, Australia",
    publisher = "Association for Computational Linguistics",
    url = "https://aclanthology.org/W18-3717/",
    doi = "10.18653/v1/W18-3717",
    pages = "119--124"
}