@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/}
}