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@article{MM2_1989__64_2_155409, author = {L. Boccardo and B. Dacorogna}, title = {Monotonicity of certain differential operators in divergence form.}, journal = {Manuscripta mathematica}, pages = {253--260}, publisher = {mathdoc}, volume = {64}, number = {2}, year = {1989}, zbl = {0718.47026}, url = {http://geodesic.mathdoc.fr/item/MM2_1989__64_2_155409/} }
L. Boccardo; B. Dacorogna. Monotonicity of certain differential operators in divergence form.. Manuscripta mathematica, Tome 64 (1989) no. 2, pp. 253-260. http://geodesic.mathdoc.fr/item/MM2_1989__64_2_155409/