@article{Salomaa_2004,
    title = {On the state complexity of reversals of regular languages},
    volume = {320},
    ISSN = {0304-3975},
    url = {http://dx.doi.org/10.1016/j.tcs.2004.02.032},
    DOI = {10.1016/j.tcs.2004.02.032},
    number = {2–3},
    journal = {Theoretical Computer Science},
    publisher = {Elsevier BV},
    author = {Salomaa, Arto and Wood, Derick and Yu, Sheng},
    year = {2004},
    month = {jun},
    pages = {315–329}
}

@article{Salomaa_2004, title = {On the state complexity of reversals of regular languages}, volume = {320}, ISSN = {0304-3975}, url = {http://dx.doi.org/10.1016/j.tcs.2004.02.032}, DOI = {10.1016/j.tcs.2004.02.032}, number = {2–3}, journal = {Theoretical Computer Science}, publisher = {Elsevier BV}, author = {Salomaa, Arto and Wood, Derick and Yu, Sheng}, year = {2004}, month = {jun}, pages = {315–329} }