On a generalization of Kaluza's theory of electricity. Einstein, A. & Bergmann, P. Annals of Mathematics (2), 39(3):683–701, July, 1938.
On a generalization of Kaluza's theory of electricity [link]Paper  bibtex   
@Article{Einstein:1938:GKT,
  author =       "Albert Einstein and Peter Bergmann",
  title =        "On a generalization of {Kaluza}'s theory of
                 electricity",
  journal =      j-ANN-MATH-2,
  volume =       "39",
  number =       "3",
  pages =        "683--701",
  month =        jul,
  year =         "1938",
  CODEN =        "ANMAAH",
  ISSN =         "0003-486X (print), 1939-8980 (electronic)",
  ISSN-L =       "0003-486X",
  MRnumber =     "MR1503432",
  bibdate =      "Wed Nov 23 14:02:29 2005",
  bibsource =    "http://www.math.utah.edu/pub/tex/bib/einstein.bib",
  URL =          "http://links.jstor.org/sici?sici=0003-486X(193807)2:39:3<683:OAGOKT>2.0.CO",
  acknowledgement = ack-nhfb,
  Calaprice-number = "213",
  fjournal =     "Annals of Mathematics. Second Series",
  Whittaker-number = "175",
}

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