%0 Journal Article
%A Doktor, Pavel
%T On the density of smooth functions in certain subspaces of Sobolev space
%J Commentationes Mathematicae Universitatis Carolinae
%D 1973
%P 609-622
%V 14
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMUC_1973__14_4_a2/
%G en
%F CMUC_1973__14_4_a2