@article{GDZPPN002419599,
title = {Best Uniform Approximation from a Collection of Subspaces.},
journal = {Mathematische Zeitschrift},
volume = {154},
year = {1977},
pages = {13-18},
zbl = {0366.41012},
url = {http://dml.mathdoc.fr/item/GDZPPN002419599}
}
Borosh, Itshak; Chui, C.K.; Smith, P.W. Best Uniform Approximation from a Collection of Subspaces.. Mathematische Zeitschrift, Tome 154 (1977) pp. 13-18. http://gdmltest.u-ga.fr/item/GDZPPN002419599/