%0 Journal Article %A J. Kucharczak %T A characterization of α-convolutions %J Colloquium Mathematicum %D 1973 %P 141-147 %V 27 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-27-1-141-147/ %R 10.4064/cm-27-1-141-147 %G en %F 10_4064_cm_27_1_141_147