@article{B_al_2003,
    doi = {10.1016/s0304-3975(01)00214-6},
    url = {https://doi.org/10.1016%2Fs0304-3975%2801%2900214-6},
    year = {2003},
    month = {jan},
    publisher = {Elsevier {BV}},
    volume = {292},
    number = {1},
    pages = {45--63},
    author = {Marie-Pierre B{\'{e}}al and Olivier Carton and Christophe Prieur and Jacques Sakarovitch},
    title = {Squaring transducers: an efficient procedure for deciding functionality and sequentiality},
    journal = {Theoretical Computer Science}
}

@article{B_al_2003, doi = {10.1016/s0304-3975(01)00214-6}, url = {https://doi.org/10.1016%2Fs0304-3975%2801%2900214-6}, year = {2003}, month = {jan}, publisher = {Elsevier {BV}}, volume = {292}, number = {1}, pages = {45--63}, author = {Marie-Pierre B{\'{e}}al and Olivier Carton and Christophe Prieur and Jacques Sakarovitch}, title = {Squaring transducers: an efficient procedure for deciding functionality and sequentiality}, journal = {Theoretical Computer Science} }