TY  - JOUR
AU  - L. Boccardo
AU  - B. Dacorogna
TI  - Monotonicity of certain differential operators in divergence form.
JO  - Manuscripta mathematica
PY  - 1989
SP  - 253
EP  - 260
VL  - 64
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MM2_1989__64_2_155409/
ID  - MM2_1989__64_2_155409
ER  -