%0 Journal Article %A Imre Kátai %T On sets characterizing number-theoretical functions %J Acta Arithmetica %D 1967 %P 315-320 %V 13 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa-13-3-315-320/ %R 10.4064/aa-13-3-315-320 %G en %F 10_4064_aa_13_3_315_320