%0 Journal Article
%T [unknown]
%J Acta mathematica Universitatis Comenianae
%D 1982
%P 279-284
%V 40-41
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AMUC_1982__40-41_185832/
%F AMUC_1982__40-41_185832