@article{ramsey,
    Author = {Ramsey, F. P.},
    EPrint = {https://londmathsoc.onlinelibrary.wiley.com/doi/pdf/10.1112/plms/s2-30.1.264},
    File = {On a Problem in Formal Logic - ramseyorig.pdf},
    Journal = {Proceedings of the London Mathematical Society},
    Keywords = {classic},
    Number = {1},
    Pages = {264--286},
    Title = {On a Problem of Formal Logic},
    URL = {https://londmathsoc.onlinelibrary.wiley.com/doi/abs/10.1112/plms/s2-30.1.264},
    Volume = {s2-30},
    Year = {1930},
    bdsk-url-1 = {https://londmathsoc.onlinelibrary.wiley.com/doi/abs/10.1112/plms/s2-30.1.264},
    bdsk-url-2 = {https://doi.org/10.1112/plms/s2-30.1.264},
    date-added = {2021-04-09 14:06:24 +0200},
    date-modified = {2021-04-09 14:06:33 +0200},
    doi = {10.1112/plms/s2-30.1.264}
}

@article{ramsey, Author = {Ramsey, F. P.}, EPrint = {https://londmathsoc.onlinelibrary.wiley.com/doi/pdf/10.1112/plms/s2-30.1.264}, File = {On a Problem in Formal Logic - ramseyorig.pdf}, Journal = {Proceedings of the London Mathematical Society}, Keywords = {classic}, Number = {1}, Pages = {264--286}, Title = {On a Problem of Formal Logic}, URL = {https://londmathsoc.onlinelibrary.wiley.com/doi/abs/10.1112/plms/s2-30.1.264}, Volume = {s2-30}, Year = {1930}, bdsk-url-1 = {https://londmathsoc.onlinelibrary.wiley.com/doi/abs/10.1112/plms/s2-30.1.264}, bdsk-url-2 = {https://doi.org/10.1112/plms/s2-30.1.264}, date-added = {2021-04-09 14:06:24 +0200}, date-modified = {2021-04-09 14:06:33 +0200}, doi = {10.1112/plms/s2-30.1.264} }