@article{Perrin_1986,
    doi = {10.1016/0022-0000(86)90037-1},
    url = {https://doi.org/10.1016%2F0022-0000%2886%2990037-1},
    year = {1986},
    month = {jun},
    publisher = {Elsevier {BV}},
    volume = {32},
    number = {3},
    pages = {393--406},
    author = {Dominique Perrin and Jean-Eric Pin},
    title = {First-order logic and star-free sets},
    journal = {Journal of Computer and System Sciences}
}

@article{Perrin_1986, doi = {10.1016/0022-0000(86)90037-1}, url = {https://doi.org/10.1016%2F0022-0000%2886%2990037-1}, year = {1986}, month = {jun}, publisher = {Elsevier {BV}}, volume = {32}, number = {3}, pages = {393--406}, author = {Dominique Perrin and Jean-Eric Pin}, title = {First-order logic and star-free sets}, journal = {Journal of Computer and System Sciences} }