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@article{MAN_1977__229_163023, author = {Bengt Winzell}, title = {The {Oblique} {Derivative} {Problem.} {I.}}, journal = {Mathematische Annalen}, pages = {267--278}, publisher = {mathdoc}, volume = {229}, year = {1977}, zbl = {0362.35025}, url = {http://geodesic.mathdoc.fr/item/MAN_1977__229_163023/} }
Bengt Winzell. The Oblique Derivative Problem. I.. Mathematische Annalen, Tome 229 (1977), pp. 267-278. http://geodesic.mathdoc.fr/item/MAN_1977__229_163023/