%0 Journal Article
%T [unknown]
%J Acta Facultatis Rerum Naturalium Universitatis Comenianae
%D 1977
%P 7-216
%V 33
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AFRNUC_1977__33_185779/
%F AFRNUC_1977__33_185779