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@article{MZ_1973__135_171995, author = {S. Hildebrandt and H.C. Wente}, title = {Variational {Problems} with {Obstacles} and a {Volume} {Constraint.}}, journal = {Mathematische Zeitschrift}, pages = {55--68}, publisher = {mathdoc}, volume = {135}, year = {1973}, zbl = {0284.49017}, url = {http://geodesic.mathdoc.fr/item/MZ_1973__135_171995/} }
S. Hildebrandt; H.C. Wente. Variational Problems with Obstacles and a Volume Constraint.. Mathematische Zeitschrift, Tome 135 (1973), pp. 55-68. http://geodesic.mathdoc.fr/item/MZ_1973__135_171995/