%0 Journal Article
%A V. I. Burenkov
%T The density of infinitely differentiable functions in Sobolev spaces for an arbitrary open set
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1974
%P 39-50
%V 131
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TM_1974_131_a4/
%G ru
%F TM_1974_131_a4