@article{GDZPPN002388391, title = {A strengthened form of a theorem of Wiener.}, journal = {Mathematische Zeitschrift}, volume = {71}, year = {1959}, pages = {31-35}, zbl = {0163.07902}, url = {http://dml.mathdoc.fr/item/GDZPPN002388391} }
Petersen, G.M.; Keogh, F.R. A strengthened form of a theorem of Wiener.. Mathematische Zeitschrift, Tome 71 (1959) pp. 31-35. http://gdmltest.u-ga.fr/item/GDZPPN002388391/