%0 Journal Article %A A. Hulanicki %T On the Spectrum of Convolution Operators on Groups with Polynomial Growth. %J Inventiones mathematicae %D 1972 %P 135-142 %V 17 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM_1972__17_142164/ %F IM_1972__17_142164