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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_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", }