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@ARTICLE{1938AnMat..39...65E,  author = "{Einstein}, A. and {Infeld}, L. and {Hoffmann}, B.",  title = "{The Gravitational Equations and the Problem of Motion}",  journal = "Annals of Mathematics",  year = "1938",  month = "jan",  volume = "39",  pages = "65-100",  adsurl = "http://adsabs.harvard.edu/abs/1938AnMat..39...65E",  adsnote = "Provided by the SAO/NASA Astrophysics Data System",  }  @article{Einstein_1948,  title = "A Generalized Theory of Gravitation",  volume = "20",  url = "http://dx.doi.org/10.1103/RevModPhys.20.35",  doi = "10.1103/RevModPhys.20.35",  number = "1",  journal = "Reviews of Modern Physics",  publisher = "American Physical Society",  author = "Einstein, Albert",  year = "1948",  month = "Jan",  pages = "35-39",  }  @article{Einstein_1916,  title = "Die Grundlage der allgemeinen Relativitätstheorie",  volume = "354",  url = "http://dx.doi.org/10.1002/andp.19163540702",  doi = "10.1002/andp.19163540702",  number = "7",  journal = "Annalen der Physik",  publisher = "Wiley Blackwell (John Wiley & Sons)",  author = "Einstein, A.",  year = "1916",  pages = "769-822",  }