@article{GDZPPN002028670,
title = {On the Number of Best Approximation in Certain Non-linear Families of Functions.},
journal = {Aequationes mathematicae},
volume = {13},
year = {1975},
pages = {184-199},
zbl = {0304.41014},
url = {http://dml.mathdoc.fr/item/GDZPPN002028670}
}
Braess, Dietrich. On the Number of Best Approximation in Certain Non-linear Families of Functions.. Aequationes mathematicae, Tome 13 (1975) pp. 184-199. http://gdmltest.u-ga.fr/item/GDZPPN002028670/