@incollection{SB_1980-1981__23__189_0,
     author = {Calabi, E.},
     title = {G\'eom\'etrie diff\'erentielle affine des hypersurfaces},
     booktitle = {S\'eminaire Bourbaki : vol. 1980/81, expos\'es 561-578},
     series = {S\'eminaire Bourbaki},
     note = {talk:573},
     pages = {189--204},
     publisher = {Springer-Verlag},
     number = {23},
     year = {1981},
     mrnumber = {647497},
     zbl = {0475.53021},
     language = {fr},
     url = {http://archive.numdam.org/item/SB_1980-1981__23__189_0/}
}