@article{MZ_1959__71_169791,
     author = {G.M. Petersen and F.R. Keogh},
     title = {A strengthened form of a theorem of {Wiener.}},
     journal = {Mathematische Zeitschrift},
     pages = {31--35},
     publisher = {mathdoc},
     volume = {71},
     year = {1959},
     zbl = {0163.07902},
     url = {http://geodesic.mathdoc.fr/item/MZ_1959__71_169791/}
}