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@article{MZ_1980__170_172918, author = {Per-Anders Ivert}, title = {On {Quasilinear} {Elliptic} {Systems} of {Diagonal} {Form.}}, journal = {Mathematische Zeitschrift}, pages = {283--286}, publisher = {mathdoc}, volume = {170}, year = {1980}, zbl = {0411.35006}, url = {http://geodesic.mathdoc.fr/item/MZ_1980__170_172918/} }
Per-Anders Ivert. On Quasilinear Elliptic Systems of Diagonal Form.. Mathematische Zeitschrift, Tome 170 (1980), pp. 283-286. http://geodesic.mathdoc.fr/item/MZ_1980__170_172918/