@article{Libkin_2006,
    doi = {10.1016/j.entcs.2005.04.041},
    url = {https://doi.org/10.1016%2Fj.entcs.2005.04.041},
    year = {2006},
    month = {jan},
    publisher = {Elsevier {BV}},
    volume = {143},
    pages = {115--127},
    author = {Leonid Libkin},
    title = {Locality of Queries and Transformations},
    journal = {Electronic Notes in Theoretical Computer Science}
}

@article{Libkin_2006, doi = {10.1016/j.entcs.2005.04.041}, url = {https://doi.org/10.1016%2Fj.entcs.2005.04.041}, year = {2006}, month = {jan}, publisher = {Elsevier {BV}}, volume = {143}, pages = {115--127}, author = {Leonid Libkin}, title = {Locality of Queries and Transformations}, journal = {Electronic Notes in Theoretical Computer Science} }