@incollection{Calbrix_1994,
    doi = {10.1007/3-540-58027-1_27},
    url = {https://doi.org/10.1007%2F3-540-58027-1_27},
    year = {1994},
    publisher = {Springer Berlin Heidelberg},
    pages = {554--566},
    author = {Hugues Calbrix and Maurice Nivat and Andreas Podelski},
    title = {Ultimately periodic words of rational {$\omega$}-languages},
    booktitle = {Lecture Notes in Computer Science}
}

@incollection{Calbrix_1994, doi = {10.1007/3-540-58027-1_27}, url = {https://doi.org/10.1007%2F3-540-58027-1_27}, year = {1994}, publisher = {Springer Berlin Heidelberg}, pages = {554--566}, author = {Hugues Calbrix and Maurice Nivat and Andreas Podelski}, title = {Ultimately periodic words of rational {$\omega$}-languages}, booktitle = {Lecture Notes in Computer Science} }