%0 Journal Article
%A Dietrich Braess
%T On the Number of Best Approximation in Certain Non-linear Families of Functions.
%J Aequationes mathematicae
%D 1975
%P 184-199
%V 12
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AM2_1975__12_136508/
%F AM2_1975__12_136508