%0 Journal Article
%A Wallace, Alexander Doniphan
%T Problems on Periodicity - Functions and Semigroups
%J Mathematica slovaca
%D 1966
%P 209-212
%V 16
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MASLO_1966__16_3_a0/
%G en
%F MASLO_1966__16_3_a0