%0 Journal Article
%A Engelking, Ryszard
%T An elementary proof of Noble's theorem on normality of powers
%J Commentationes Mathematicae Universitatis Carolinae
%D 1988
%P 677-678
%V 29
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMUC_1988__29_4_a5/
%G en
%F CMUC_1988__29_4_a5