@article{Simmons_2019,
    doi = {10.1016/j.aim.2018.11.026},
    url = {https://doi.org/10.1016%2Fj.aim.2018.11.026},
    year = {2019},
    month = {feb},
    publisher = {Elsevier {BV}},
    volume = {343},
    pages = {567--623},
    author = {William Simmons and Henry Towsner},
    title = {Proof mining and effective bounds in differential polynomial rings},
    journal = {Advances in Mathematics}
}

@article{Simmons_2019, doi = {10.1016/j.aim.2018.11.026}, url = {https://doi.org/10.1016%2Fj.aim.2018.11.026}, year = {2019}, month = {feb}, publisher = {Elsevier {BV}}, volume = {343}, pages = {567--623}, author = {William Simmons and Henry Towsner}, title = {Proof mining and effective bounds in differential polynomial rings}, journal = {Advances in Mathematics} }