@article{MZ_1982__179_173142,
     author = {Heinrich Begehr and Gerald N. Hile},
     title = {Nonlinear {Riemann} {Boundary} {Value} {Problems} for a {Nonlinear} {Elliptic} {System} in the {Plane.}},
     journal = {Mathematische Zeitschrift},
     pages = {241--262},
     publisher = {mathdoc},
     volume = {179},
     year = {1982},
     zbl = {0484.35074},
     url = {http://geodesic.mathdoc.fr/item/MZ_1982__179_173142/}
}