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@article{AM2_1975__12_136508, author = {Dietrich Braess}, title = {On the {Number} of {Best} {Approximation} in {Certain} {Non-linear} {Families} of {Functions.}}, journal = {Aequationes mathematicae}, pages = {184--199}, publisher = {mathdoc}, volume = {12}, year = {1975}, zbl = {0304.41014}, url = {http://geodesic.mathdoc.fr/item/AM2_1975__12_136508/} }
Dietrich Braess. On the Number of Best Approximation in Certain Non-linear Families of Functions.. Aequationes mathematicae, Tome 12 (1975), pp. 184-199. http://geodesic.mathdoc.fr/item/AM2_1975__12_136508/