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@article{PORMA_2002__59_2_54539, author = {Santos, Lisa}, title = {Variational problems with non-constant gradient constraints.}, journal = {Portugaliae mathematica}, pages = {205--248}, publisher = {mathdoc}, volume = {59}, number = {2}, year = {2002}, zbl = {1146.35387}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_2002__59_2_54539/} }
Santos, Lisa. Variational problems with non-constant gradient constraints.. Portugaliae mathematica, Tome 59 (2002) no. 2, pp. 205-248. http://geodesic.mathdoc.fr/item/PORMA_2002__59_2_54539/