%0 Journal Article
%T [unknown]
%J Acta mathematica Universitatis Comenianae
%D 1983
%P 285-290
%V 42-43
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AMUC_1983__42-43_185865/
%F AMUC_1983__42-43_185865