@article{Schutzenberger_1968,
    author = {Marcel-Paul Schützenberger},
    doi = {https://dx.doi.org/10.1016/s0021-9800(68)80003-1},
    title = {{On an enumeration problem}},
    volume = {4},
    issn = {0021-9800},
    url = {http://dx.doi.org/10.1016/S0021-9800(68)80003-1},
    number = {3},
    journal = {Journal of Combinatorial Theory},
    publisher = {Elsevier BV},
    year = {1968},
    month = {apr},
    pages = {219–221},
    date-added = {2025-3-9 18:55:28 +0100},
    date-modified = {2025-10-16 20:5:21 +0100}
}

@article{Schutzenberger_1968, author = {Marcel-Paul Schützenberger}, doi = {https://dx.doi.org/10.1016/s0021-9800(68)80003-1}, title = {{On an enumeration problem}}, volume = {4}, issn = {0021-9800}, url = {http://dx.doi.org/10.1016/S0021-9800(68)80003-1}, number = {3}, journal = {Journal of Combinatorial Theory}, publisher = {Elsevier BV}, year = {1968}, month = {apr}, pages = {219–221}, date-added = {2025-3-9 18:55:28 +0100}, date-modified = {2025-10-16 20:5:21 +0100} }