%0 Journal Article
%A H. Brezis
%T How to recognize constant functions. Connections with Sobolev spaces
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 2002
%P 693-708
%V 57
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_2002_57_4_a1/
%G en
%F RM_2002_57_4_a1