@article{MZ_1986__191_173702,
     author = {Martin Fuchs and Frank Duzaar},
     title = {Variational {Problems} with {Non-Convex} {Obstacles} an and {Integral-Constraint} for {Vector-Valued} {Functions.}},
     journal = {Mathematische Zeitschrift},
     pages = {585--592},
     publisher = {mathdoc},
     volume = {191},
     year = {1986},
     zbl = {0568.49009},
     url = {http://geodesic.mathdoc.fr/item/MZ_1986__191_173702/}
}