@article{Bj_rklund_2010,
    doi = {10.1016/j.tcs.2009.10.009},
    url = {https://doi.org/10.1016%2Fj.tcs.2009.10.009},
    year = {2010},
    month = {jan},
    publisher = {Elsevier {BV}},
    volume = {411},
    number = {4-5},
    pages = {702--715},
    author = {Henrik Björklund and Thomas Schwentick},
    title = {On notions of regularity for data languages},
    journal = {Theoretical Computer Science}
}

@article{Bj_rklund_2010, doi = {10.1016/j.tcs.2009.10.009}, url = {https://doi.org/10.1016%2Fj.tcs.2009.10.009}, year = {2010}, month = {jan}, publisher = {Elsevier {BV}}, volume = {411}, number = {4-5}, pages = {702--715}, author = {Henrik Björklund and Thomas Schwentick}, title = {On notions of regularity for data languages}, journal = {Theoretical Computer Science} }