@article{Frick_2001,
    doi = {10.1145/504794.504798},
    url = {https://doi.org/10.1145%2F504794.504798},
    year = {2001},
    month = {nov},
    publisher = {Association for Computing Machinery ({ACM})},
    volume = {48},
    number = {6},
    pages = {1184--1206},
    author = {Markus Frick and Martin Grohe},
    title = {Deciding first-order properties of locally tree-decomposable structures},
    journal = {Journal of the {ACM}}
}

@article{Frick_2001, doi = {10.1145/504794.504798}, url = {https://doi.org/10.1145%2F504794.504798}, year = {2001}, month = {nov}, publisher = {Association for Computing Machinery ({ACM})}, volume = {48}, number = {6}, pages = {1184--1206}, author = {Markus Frick and Martin Grohe}, title = {Deciding first-order properties of locally tree-decomposable structures}, journal = {Journal of the {ACM}} }