@article{10_4064_sm_77_5_437_438,
     author = {Jean-Pierre Kahane},
     title = {Une preuve rapide du th\'eor\`eme de {Beurling} et {Helson} sur les endomorphismes de l'alg\`ebre {l{\textonesuperior}(Z)}},
     journal = {Studia Mathematica},
     pages = {437--438},
     year = {1983},
     volume = {77},
     number = {5},
     doi = {10.4064/sm-77-5-437-438},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-77-5-437-438/}
}