@article{MM2_1979__28_154635,
     author = {Michael Meier and Stefan Hildebrandr},
     title = {On {Variational} {Problems} with {Obstacles} and {Integral} {Constraints} for {Vector-Valued} {Functions.}},
     journal = {Manuscripta mathematica},
     pages = {185--206},
     publisher = {mathdoc},
     volume = {28},
     year = {1979},
     zbl = {0432.35002},
     url = {http://geodesic.mathdoc.fr/item/MM2_1979__28_154635/}
}