@inproceedings{Billot_1989,
    doi = {10.3115/981623.981641},
    url = {https://doi.org/10.3115%2F981623.981641},
    year = {1989},
    publisher = {Association for Computational Linguistics},
    author = {Sylvie Billot and Bernard Lang},
    title = {The structure of shared forests in ambiguous parsing},
    booktitle = {Proceedings of the 27th annual meeting on Association for Computational Linguistics  -}
}

@inproceedings{Billot_1989, doi = {10.3115/981623.981641}, url = {https://doi.org/10.3115%2F981623.981641}, year = {1989}, publisher = {Association for Computational Linguistics}, author = {Sylvie Billot and Bernard Lang}, title = {The structure of shared forests in ambiguous parsing}, booktitle = {Proceedings of the 27th annual meeting on Association for Computational Linguistics -} }