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@article{MZ_1981__178_173118, author = {Michael Wiegner}, title = {On {Two-Dimensional} {Elliptic} {Systems} with a {One-sided} {Condition.}}, journal = {Mathematische Zeitschrift}, pages = {493--500}, publisher = {mathdoc}, volume = {178}, year = {1981}, zbl = {0474.35046}, url = {http://geodesic.mathdoc.fr/item/MZ_1981__178_173118/} }
Michael Wiegner. On Two-Dimensional Elliptic Systems with a One-sided Condition.. Mathematische Zeitschrift, Tome 178 (1981), pp. 493-500. http://geodesic.mathdoc.fr/item/MZ_1981__178_173118/