On the Number of Best Approximation in Certain Non-linear Families of Functions.
Aequationes mathematicae, Tome 12 (1975), pp. 184-199.

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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/}
}
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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/