@article{Birman_1973,
    doi = {10.1016/s0019-9958(73)90851-6},
    url = {https://doi.org/10.1016%2Fs0019-9958%2873%2990851-6},
    year = {1973},
    month = {aug},
    publisher = {Elsevier {BV}},
    volume = {23},
    number = {1},
    pages = {1--34},
    author = {Alexander Birman and Jeffrey D. Ullman},
    title = {Parsing algorithms with backtrack},
    journal = {Information and Control}
}

@article{Birman_1973, doi = {10.1016/s0019-9958(73)90851-6}, url = {https://doi.org/10.1016%2Fs0019-9958%2873%2990851-6}, year = {1973}, month = {aug}, publisher = {Elsevier {BV}}, volume = {23}, number = {1}, pages = {1--34}, author = {Alexander Birman and Jeffrey D. Ullman}, title = {Parsing algorithms with backtrack}, journal = {Information and Control} }