@article{Aschenbrenner_2002,
    doi = {10.1007/s002090000358},
    url = {https://doi.org/10.1007%2Fs002090000358},
    year = {2002},
    month = {apr},
    publisher = {Springer Science and Business Media {LLC}},
    volume = {242},
    number = {3},
    pages = {543--588},
    author = {Matthias Aschenbrenner and Lou van den Dries},
    title = {H -fields and their Liouville extensions},
    journal = {Mathematische Zeitschrift}
}

@article{Aschenbrenner_2002, doi = {10.1007/s002090000358}, url = {https://doi.org/10.1007%2Fs002090000358}, year = {2002}, month = {apr}, publisher = {Springer Science and Business Media {LLC}}, volume = {242}, number = {3}, pages = {543--588}, author = {Matthias Aschenbrenner and Lou van den Dries}, title = {H -fields and their Liouville extensions}, journal = {Mathematische Zeitschrift} }