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@article{MM2_1986__55_155152, author = {Alfred Baldes}, title = {Degenerate {Elliptic} {Operators} {Diagonal} {Systems} and {Variational} {Integrals.}}, journal = {Manuscripta mathematica}, pages = {467--486}, publisher = {mathdoc}, volume = {55}, year = {1986}, zbl = {0616.35039}, url = {http://geodesic.mathdoc.fr/item/MM2_1986__55_155152/} }
Alfred Baldes. Degenerate Elliptic Operators Diagonal Systems and Variational Integrals.. Manuscripta mathematica, Tome 55 (1986), pp. 467-486. http://geodesic.mathdoc.fr/item/MM2_1986__55_155152/