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@article{MM2_1984__48_155025, author = {Karlheinz Sch\"uffler}, title = {Eine globalanalytische {Behandlung} des {Douglas'schen} {Problems.}}, journal = {Manuscripta mathematica}, pages = {189--226}, publisher = {mathdoc}, volume = {48}, year = {1984}, zbl = {0606.58047}, url = {http://geodesic.mathdoc.fr/item/MM2_1984__48_155025/} }
Karlheinz Schüffler. Eine globalanalytische Behandlung des Douglas'schen Problems.. Manuscripta mathematica, Tome 48 (1984), pp. 189-226. http://geodesic.mathdoc.fr/item/MM2_1984__48_155025/