@article{Atserias_2008,
    doi = {10.1137/060658709},
    url = {https://doi.org/10.1137%2F060658709},
    year = {2008},
    month = {jan},
    publisher = {Society for Industrial {\&} Applied Mathematics ({SIAM})},
    volume = {38},
    number = {4},
    pages = {1364--1381},
    author = {Albert Atserias and Anuj Dawar and Martin Grohe},
    title = {Preservation under Extensions on Well-Behaved Finite Structures},
    journal = {{SIAM} Journal on Computing}
}

@article{Atserias_2008, doi = {10.1137/060658709}, url = {https://doi.org/10.1137%2F060658709}, year = {2008}, month = {jan}, publisher = {Society for Industrial {\&} Applied Mathematics ({SIAM})}, volume = {38}, number = {4}, pages = {1364--1381}, author = {Albert Atserias and Anuj Dawar and Martin Grohe}, title = {Preservation under Extensions on Well-Behaved Finite Structures}, journal = {{SIAM} Journal on Computing} }