@inproceedings{kupiec-1992-algorithm,
    title = "An Algorithm for Estimating the Parameters of Unrestricted Hidden Stochastic Context-Free Grammars",
    author = "Kupiec, Julian",
    booktitle = "{COLING} 1992 Volume 1: The 14th {I}nternational {C}onference on {C}omputational {L}inguistics",
    year = "1992",
    url = "https://aclanthology.org/C92-1060/"
}