Rigidity and cocycles for ergodic actions of semi-simple Lie groups
Séminaire Bourbaki : vol. 1979/80, exposés 543-560, Séminaire Bourbaki, no. 22 (1981), Exposé no. 559, 20 p. 
@incollection{SB_1979-1980__22__273_0,
     author = {Furstenberg, Harry},
     title = {Rigidity and cocycles for ergodic actions of semi-simple Lie groups},
     booktitle = {S\'eminaire Bourbaki : vol. 1979/80, expos\'es 543-560},
     author = {Collectif},
     series = {S\'eminaire Bourbaki},
     note = {talk:559},
     publisher = {Springer-Verlag},
     number = {22},
     year = {1981},
     zbl = {0471.22007},
     mrnumber = {636529},
     language = {en},
     url = {http://www.numdam.org/item/SB_1979-1980__22__273_0/}
}
Furstenberg, Harry. Rigidity and cocycles for ergodic actions of semi-simple Lie groups, dans Séminaire Bourbaki : vol. 1979/80, exposés 543-560, Séminaire Bourbaki, no. 22 (1981), Exposé no. 559, 20 p. http://www.numdam.org/item/SB_1979-1980__22__273_0/

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