%0 Journal Article
%T [unknown]
%J Acta Facultatis Rerum Naturalium Universitatis Comenianae
%D 1979
%P 7-228
%V 34
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AFRNUC_1979__34_185780/
%F AFRNUC_1979__34_185780