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@article{MZ_1986__191_173686, author = {Friedmar Schulz}, title = {\"Uber nichtlineare, konkave, elliptische {Differentialgleichungen.}}, journal = {Mathematische Zeitschrift}, pages = {429--448}, publisher = {mathdoc}, volume = {191}, year = {1986}, zbl = {0594.35033}, url = {http://geodesic.mathdoc.fr/item/MZ_1986__191_173686/} }
Friedmar Schulz. Über nichtlineare, konkave, elliptische Differentialgleichungen.. Mathematische Zeitschrift, Tome 191 (1986), pp. 429-448. http://geodesic.mathdoc.fr/item/MZ_1986__191_173686/