@article{10_21136_CMJ_1956_100189,
     author = {Schinzel, Andr\'e},
     title = {Sur un probl\`eme concernant la fonction $\varphi(n)$},
     journal = {Czechoslovak Mathematical Journal},
     pages = {164--165},
     publisher = {mathdoc},
     volume = {06},
     number = {2},
     year = {1956},
     doi = {10.21136/CMJ.1956.100189},
     mrnumber = {0084005},
     zbl = {0075.03103},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1956.100189/}
}