%0 Journal Article
%T [unknown]
%J Acta Facultatis Rerum Naturalium Universitatis Comenianae
%D 1980
%P 7-239
%V 35
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AFRNUC_1980__35_185781/
%F AFRNUC_1980__35_185781