@incollection{AST_1976__40__95_0,
     author = {Goldstein, S.},
     title = {Spectrum of measurable flows},
     booktitle = {International conference on dynamical systems in mathematical physics},
     series = {Ast\'erisque},
     pages = {95--98},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {40},
     year = {1976},
     mrnumber = {450511},
     zbl = {0342.47006},
     language = {en},
     url = {http://www.numdam.org/item/AST_1976__40__95_0/}
}