%0 Journal Article
%T [unknown]
%J Acta mathematica Universitatis Comenianae
%D 1984
%P 237-244
%V 44-45
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AMUC_1984__44-45_185893/
%F AMUC_1984__44-45_185893