@inproceedings{liu-etal-2005-product,
    title = "Product Named Entity Recognition Based on Hierarchical Hidden {M}arkov Model",
    author = "Liu, Feifan  and
      Zhao, Jun  and
      Lv, Bibo  and
      Xu, Bo  and
      Yu, Hao",
    booktitle = "Proceedings of the Fourth {SIGHAN} Workshop on {C}hinese Language Processing",
    year = "2005",
    url = "https://aclanthology.org/I05-3006/"
}