@article{Robertson_1994,
    doi = {10.1006/jctb.1994.1073},
    url = {https://doi.org/10.1006%2Fjctb.1994.1073},
    year = {1994},
    month = {nov},
    publisher = {Elsevier {BV}},
    volume = {62},
    number = {2},
    pages = {323--348},
    author = {N. Robertson and P. Seymour and R. Thomas},
    title = {Quickly Excluding a Planar Graph},
    journal = {Journal of Combinatorial Theory, Series B}
}

@article{Robertson_1994, doi = {10.1006/jctb.1994.1073}, url = {https://doi.org/10.1006%2Fjctb.1994.1073}, year = {1994}, month = {nov}, publisher = {Elsevier {BV}}, volume = {62}, number = {2}, pages = {323--348}, author = {N. Robertson and P. Seymour and R. Thomas}, title = {Quickly Excluding a Planar Graph}, journal = {Journal of Combinatorial Theory, Series B} }