%0 Journal Article
%A L. Boccardo
%A B. Dacorogna
%T Monotonicity of certain differential operators in divergence form.
%J Manuscripta mathematica
%D 1989
%P 253-260
%V 64
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MM2_1989__64_2_155409/
%F MM2_1989__64_2_155409