@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/}
}