@inproceedings{xiao-etal-2005-principles,
    title = "Principles of Non-stationary Hidden {M}arkov Model and Its Applications to Sequence Labeling Task",
    author = "Xiao, JingHui  and
      Liu, BingQuan  and
      Wang, XiaoLong",
    booktitle = "Second International Joint Conference on Natural Language Processing: Full Papers",
    year = "2005",
    url = "https://preview.aclanthology.org/Add-Cong-Liu-Florida-Atlantic-University-author-id/I05-1072/",
    doi = "10.1007/11562214_72"
}