Albert Einstein added missing citations to bibliography  almost 11 years ago

Commit id: 89df87de593a853104d2029aaf603e1739f1eea9

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@ARTICLE{1948RvMP...20...35E,  author = "{Einstein}, A.",  title = "{A Generalized Theory of Gravitation}",  journal = "Reviews of Modern Physics",  year = "1948",  month = "jan",  volume = "20",  pages = "35-39",  doi = "10.1103/RevModPhys.20.35",  adsurl = "http://adsabs.harvard.edu/abs/1948RvMP...20...35E",  adsnote = "Provided by the SAO/NASA Astrophysics Data System",  }