@inproceedings{xiong-etal-2021-progressively,
    title = "Progressively Pretrained Dense Corpus Index for Open-Domain Question Answering",
    author = "Xiong, Wenhan  and
      Wang, Hong  and
      Wang, William Yang",
    editor = "Merlo, Paola  and
      Tiedemann, Jorg  and
      Tsarfaty, Reut",
    booktitle = "Proceedings of the 16th Conference of the European Chapter of the Association for Computational Linguistics: Main Volume",
    month = apr,
    year = "2021",
    address = "Online",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/jlcl-multiple-ingestion/2021.eacl-main.244/",
    doi = "10.18653/v1/2021.eacl-main.244",
    pages = "2803--2815"
}