@incollection{SB_1956-1958__4__49_0,
     author = {Dixmier, Jacques},
     title = {Travaux de Kadison sur les invariants unitaires},
     booktitle = {S\'eminaire Bourbaki : ann\'ees 1956/57 - 1957/58, expos\'es 137-168},
     author = {Collectif},
     series = {S\'eminaire Bourbaki},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {4},
     year = {1958},
     note = {talk:140},
     pages = {49-56},
     zbl = {0144.38002},
     mrnumber = {1610941},
     language = {fr},
     url = {http://www.numdam.org/item/SB_1956-1958__4__49_0}
}

Dixmier, Jacques. Travaux de Kadison sur les invariants unitaires, in Séminaire Bourbaki : années 1956/57 - 1957/58, exposés 137-168, Séminaire Bourbaki, no. 4 (1958), Talk no. 140, pp. 49-56. http://www.numdam.org/item/SB_1956-1958__4__49_0/