@incollection{MSMF_1976__46__41_0,
     author = {La Harpe, Pierre de and Karoubi, Max},
     title = {Perturbations compactes des repr\'esentations d'un groupe dans un espace de {Hilbert}},
     booktitle = {Journ\'ees sur la g\'eom\'etrie de la dimension infinie (Lyon, 1975)},
     series = {M\'emoires de la Soci\'et\'e Math\'ematique de France},
     pages = {41--65},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {46},
     year = {1976},
     doi = {10.24033/msmf.184},
     mrnumber = {54 #12964},
     zbl = {0331.46051},
     url = {http://archive.numdam.org/articles/10.24033/msmf.184/}
}