@article{MAN_1927__97_182669,
     author = {A. Einstein},
     title = {\"Uber die formale {Beziehung} des {Riemannschen} {Kr\"ummnngstensors} zu den {Feldgleichungen} der {Gravitation}},
     journal = {Mathematische Annalen},
     pages = {99--103},
     publisher = {mathdoc},
     volume = {97},
     year = {1927},
     zbl = {52.0917.04},
     url = {http://geodesic.mathdoc.fr/item/MAN_1927__97_182669/}
}