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\smallheadfont IHES, Centre de conf^^Serences Ma-ri-lyn et James Si-mons( S^^Se
minaire Math^^Sematique

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\smallheadfont Titre : \OT1/cmr/m/it/10.95 Com-plexes as-soci^^Ses ^^Ra une ac-
tion libre d'un 2-groupe ab^^Selien ^^Sel^^Sementaire
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l.50 ...-module de la cohomologie équivariante H*_
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