@inproceedings{voita-etal-2019-bottom,
    title = "The Bottom-up Evolution of Representations in the Transformer: A Study with Machine Translation and Language Modeling Objectives",
    author = "Voita, Elena  and
      Sennrich, Rico  and
      Titov, Ivan",
    editor = "Inui, Kentaro  and
      Jiang, Jing  and
      Ng, Vincent  and
      Wan, Xiaojun",
    booktitle = "Proceedings of the 2019 Conference on Empirical Methods in Natural Language Processing and the 9th International Joint Conference on Natural Language Processing (EMNLP-IJCNLP)",
    month = nov,
    year = "2019",
    address = "Hong Kong, China",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/jlcl-multiple-ingestion/D19-1448/",
    doi = "10.18653/v1/D19-1448",
    pages = "4396--4406"
}