@incollection{SB_1974-1975__17__223_0,
     author = {Koszul, Jean-Louis},
     title = {Rigidit\'e forte des espaces riemanniens localement sym\'etriques},
     booktitle = {S\'eminaire Bourbaki : vol. 1974/75, expos\'es 453-470},
     series = {S\'eminaire Bourbaki},
     note = {talk:468},
     pages = {223--237},
     publisher = {Springer-Verlag},
     number = {17},
     year = {1976},
     mrnumber = {473103},
     zbl = {0329.53042},
     language = {fr},
     url = {http://www.numdam.org/item/SB_1974-1975__17__223_0/}
}