On the Number of Best Approximations in Certain Non-Linear Families of Functions. (Short Communication).
Aequationes mathematicae, Tome 11 (1974), pp. 118-119.

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@article{AM2_1974__11_136446,
     author = {Dietrich Braess},
     title = {On the {Number} of {Best} {Approximations} in {Certain} {Non-Linear} {Families} of {Functions.} {(Short} {Communication).}},
     journal = {Aequationes mathematicae},
     pages = {118--119},
     publisher = {mathdoc},
     volume = {11},
     year = {1974},
     zbl = {0252.41026},
     url = {http://geodesic.mathdoc.fr/item/AM2_1974__11_136446/}
}
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Dietrich Braess. On the Number of Best Approximations in Certain Non-Linear Families of Functions. (Short Communication).. Aequationes mathematicae, Tome 11 (1974), pp. 118-119. http://geodesic.mathdoc.fr/item/AM2_1974__11_136446/