@article{Libkin_2015,
    doi = {10.1016/j.jcss.2015.03.005},
    url = {https://doi.org/10.1016%2Fj.jcss.2015.03.005},
    year = {2015},
    month = {nov},
    publisher = {Elsevier {BV}},
    volume = {81},
    number = {7},
    pages = {1278--1297},
    author = {Leonid Libkin and Tony Tan and Domagoj Vrgo{\v{c}}},
    title = {Regular expressions for data words},
    journal = {Journal of Computer and System Sciences}
}

@article{Libkin_2015, doi = {10.1016/j.jcss.2015.03.005}, url = {https://doi.org/10.1016%2Fj.jcss.2015.03.005}, year = {2015}, month = {nov}, publisher = {Elsevier {BV}}, volume = {81}, number = {7}, pages = {1278--1297}, author = {Leonid Libkin and Tony Tan and Domagoj Vrgo{\v{c}}}, title = {Regular expressions for data words}, journal = {Journal of Computer and System Sciences} }