@article{Brzozowski_2011,
    doi = {10.1016/j.ic.2010.11.009},
    url = {https://doi.org/10.1016%2Fj.ic.2010.11.009},
    year = {2011},
    month = {mar},
    publisher = {Elsevier {BV}},
    volume = {209},
    number = {3},
    pages = {353--367},
    author = {Janusz Brzozowski and Jeffrey Shallit and Zhi Xu},
    title = {Decision problems for convex languages},
    journal = {Information and Computation}
}

@article{Brzozowski_2011, doi = {10.1016/j.ic.2010.11.009}, url = {https://doi.org/10.1016%2Fj.ic.2010.11.009}, year = {2011}, month = {mar}, publisher = {Elsevier {BV}}, volume = {209}, number = {3}, pages = {353--367}, author = {Janusz Brzozowski and Jeffrey Shallit and Zhi Xu}, title = {Decision problems for convex languages}, journal = {Information and Computation} }