%0 Journal Article %A P. Erdös %A M. Kac %A E. van Kampen %A A. Wintner %T Ramanujan sums and almost periodic functions %J Studia Mathematica %D 1940 %P 43-53 %V 9 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-9-1-43-53/ %R 10.4064/sm-9-1-43-53 %G en %F 10_4064_sm_9_1_43_53