%0 Journal Article
%T [unknown]
%J Acta Facultatis Rerum Naturalium Universitatis Comenianae
%D 1980
%P 7-228
%V 36
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AFRNUC_1980__36_185782/
%F AFRNUC_1980__36_185782