@article{Brouwer_1911,
    doi = {10.1007/bf01456931},
    url = {https://doi.org/10.1007%2Fbf01456931},
    year = {1911},
    month = {mar},
    publisher = {Springer Science and Business Media {LLC}},
    volume = {71},
    number = {1},
    pages = {97--115},
    author = {L. E. J. Brouwer},
    title = {\"Uber Abbildung von Mannigfaltigkeiten},
    journal = {Mathematische Annalen}
}

@article{Brouwer_1911, doi = {10.1007/bf01456931}, url = {https://doi.org/10.1007%2Fbf01456931}, year = {1911}, month = {mar}, publisher = {Springer Science and Business Media {LLC}}, volume = {71}, number = {1}, pages = {97--115}, author = {L. E. J. Brouwer}, title = {\"Uber Abbildung von Mannigfaltigkeiten}, journal = {Mathematische Annalen} }