@article{1183532622,
author = {Wulbert, Daniel},
title = {Uniqueness and differential characterization of approximations from manifolds of functions},
journal = {Bull. Amer. Math. Soc.},
volume = {77},
number = {6},
year = {1971},
pages = { 88-91},
language = {en},
url = {http://dml.mathdoc.fr/item/1183532622}
}
Wulbert, Daniel. Uniqueness and differential characterization of approximations from manifolds of functions. Bull. Amer. Math. Soc., Tome 77 (1971) no. 6, pp. 88-91. http://gdmltest.u-ga.fr/item/1183532622/