@incollection{SB_1961-1962__7__273_0,
     author = {Weil, Andr\'e},
     title = {Un th\'eor\`eme fondamental de {Chern} en g\'eom\'etrie riemannienne},
     booktitle = {S\'eminaire Bourbaki : ann\'ee 1961/62, expos\'es 223-240},
     series = {S\'eminaire Bourbaki},
     note = {talk:239},
     pages = {273--284},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {7},
     year = {1962},
     mrnumber = {1611223},
     zbl = {0116.38801},
     language = {fr},
     url = {http://www.numdam.org/item/SB_1961-1962__7__273_0/}
}