@article{ZAA_1999__18_2_48450,
     author = {Begehr, H. and Wen, G.C.},
     title = {Oblique derivative problems for elliptic systems of second order equations in infinite domains.},
     journal = {Zeitschrift f\"ur Analysis und ihre Anwendungen},
     pages = {193--204},
     publisher = {mathdoc},
     volume = {18},
     number = {2},
     year = {1999},
     zbl = {0939.35057},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZAA_1999__18_2_48450/}
}