@article {MR1512217,
    AUTHOR = {Urysohn, Paul},
     TITLE = {Der {H}ilbertsche {R}aum als {U}rbild der metrischen
              {R}\"{a}ume},
   JOURNAL = {Math. Ann.},
  FJOURNAL = {Mathematische Annalen},
    VOLUME = {92},
      YEAR = {1924},
    NUMBER = {3-4},
     PAGES = {302--304},
      ISSN = {0025-5831,1432-1807},
   MRCLASS = {99-04},
  MRNUMBER = {1512217},
       DOI = {10.1007/BF01448012},
       URL = {https://doi.org/10.1007/BF01448012},
}

@article {MR1512406,
    AUTHOR = {Urysohn, Paul and Alexandroff, Paul},
     TITLE = {\"{U}ber im kleinen zusammenh\"{a}ngende {K}ontinua},
   JOURNAL = {Math. Ann.},
  FJOURNAL = {Mathematische Annalen},
    VOLUME = {98},
      YEAR = {1928},
    NUMBER = {1},
     PAGES = {296--308},
      ISSN = {0025-5831,1432-1807},
   MRCLASS = {99-04},
  MRNUMBER = {1512406},
       DOI = {10.1007/BF01451595},
       URL = {https://doi.org/10.1007/BF01451595},
}

@article {MR1544734,
    AUTHOR = {Urysohn, Paul},
     TITLE = {Zur ersten {R}andwertaufgabe der {P}otentialtheorie. {E}in
              {F}all der {U}nl\"{o}sbarkeit},
   JOURNAL = {Math. Z.},
  FJOURNAL = {Mathematische Zeitschrift},
    VOLUME = {23},
      YEAR = {1925},
    NUMBER = {1},
     PAGES = {155--158},
      ISSN = {0025-5874,1432-1823},
   MRCLASS = {99-04},
  MRNUMBER = {1544734},
       DOI = {10.1007/BF01506224},
       URL = {https://doi.org/10.1007/BF01506224},
}


@article {MR1544691,
    AUTHOR = {Urysohn, Paul},
     TITLE = {Ein {B}eitrag zur {T}heorie der ebenen {G}ebiete unendlich
              hohen {Z}usammenhanges},
   JOURNAL = {Math. Z.},
  FJOURNAL = {Mathematische Zeitschrift},
    VOLUME = {21},
      YEAR = {1924},
    NUMBER = {1},
     PAGES = {133--150},
      ISSN = {0025-5874,1432-1823},
   MRCLASS = {99-04},
  MRNUMBER = {1544691},
       DOI = {10.1007/BF01187458},
       URL = {https://doi.org/10.1007/BF01187458},
}

@article {MR1512258,
    AUTHOR = {Urysohn, Paul},
     TITLE = {\"{U}ber die {M}\"{a}chtigkeit der zusammenh\"{a}ngenden
              {M}engen},
   JOURNAL = {Math. Ann.},
  FJOURNAL = {Mathematische Annalen},
    VOLUME = {94},
      YEAR = {1925},
    NUMBER = {1},
     PAGES = {262--295},
      ISSN = {0025-5831,1432-1807},
   MRCLASS = {99-04},
  MRNUMBER = {1512258},
       DOI = {10.1007/BF01208659},
       URL = {https://doi.org/10.1007/BF01208659},
}

@article {MR1512260,
    AUTHOR = {Urysohn, Paul},
     TITLE = {Zum {M}etrisationsproblem},
   JOURNAL = {Math. Ann.},
  FJOURNAL = {Mathematische Annalen},
    VOLUME = {94},
      YEAR = {1925},
    NUMBER = {1},
     PAGES = {309--315},
      ISSN = {0025-5831,1432-1807},
   MRCLASS = {99-04},
  MRNUMBER = {1512260},
       DOI = {10.1007/BF01208661},
       URL = {https://doi.org/10.1007/BF01208661},
}


@article {MR1512215,
    AUTHOR = {Urysohn, Paul},
     TITLE = {\"{U}ber die {M}etrisation der kompakten topologischen
              {R}\"{a}ume},
   JOURNAL = {Math. Ann.},
  FJOURNAL = {Mathematische Annalen},
    VOLUME = {92},
      YEAR = {1924},
    NUMBER = {3-4},
     PAGES = {275--293},
      ISSN = {0025-5831,1432-1807},
   MRCLASS = {99-04},
  MRNUMBER = {1512215},
       DOI = {10.1007/BF01448010},
       URL = {https://doi.org/10.1007/BF01448010},
}

@article {MR1512259,
    AUTHOR = {Alexandroff, Paul},
     TITLE = {Zur {B}egr\"{u}ndung der {$n$}-dimensionalen
              mengentheoretischen {T}opologie},
   JOURNAL = {Math. Ann.},
  FJOURNAL = {Mathematische Annalen},
    VOLUME = {94},
      YEAR = {1925},
    NUMBER = {1},
     PAGES = {296--308},
      ISSN = {0025-5831,1432-1807},
   MRCLASS = {99-04},
  MRNUMBER = {1512259},
       DOI = {10.1007/BF01208660},
       URL = {https://doi.org/10.1007/BF01208660},
}


@article {MR1512214,
    AUTHOR = {Alexandroff, Paul},
     TITLE = {\"{U}ber die {S}truktur der bikompakten topologischen
              {R}\"{a}ume},
   JOURNAL = {Math. Ann.},
  FJOURNAL = {Mathematische Annalen},
    VOLUME = {92},
      YEAR = {1924},
    NUMBER = {3-4},
     PAGES = {267--274},
      ISSN = {0025-5831,1432-1807},
   MRCLASS = {99-04},
  MRNUMBER = {1512214},
       DOI = {10.1007/BF01448009},
       URL = {https://doi.org/10.1007/BF01448009},
}

@article {MR1512213,
    AUTHOR = {Alexandroff, Paul and Urysohn, Paul},
     TITLE = {Zur {T}heorie der topologischen {R}\"{a}ume},
   JOURNAL = {Math. Ann.},
  FJOURNAL = {Mathematische Annalen},
    VOLUME = {92},
      YEAR = {1924},
    NUMBER = {3-4},
     PAGES = {258--266},
      ISSN = {0025-5831,1432-1807},
   MRCLASS = {99-04},
  MRNUMBER = {1512213},
       DOI = {10.1007/BF01448008},
       URL = {https://doi.org/10.1007/BF01448008},
}