%0 Journal Article %A George S. Shapiro %T Balayage by Fourier transforms with sparse frequencies in compact abelian groups %J Colloquium Mathematicum %D 1981 %P 151-157 %V 44 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-44-1-151-157/ %R 10.4064/cm-44-1-151-157 %G en %F 10_4064_cm_44_1_151_157