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@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/} }
G.M. Petersen; F.R. Keogh. A strengthened form of a theorem of Wiener.. Mathematische Zeitschrift, Tome 71 (1959), pp. 31-35. http://geodesic.mathdoc.fr/item/MZ_1959__71_169791/