@article{1028999132,
author = {Shapiro, Harold S.},
title = {Some negative theorems of approximation theory.},
journal = {Michigan Math. J.},
volume = {11},
number = {1},
year = {1964},
pages = { 211-217},
language = {en},
url = {http://dml.mathdoc.fr/item/1028999132}
}
Shapiro, Harold S. Some negative theorems of approximation theory.. Michigan Math. J., Tome 11 (1964) no. 1, pp. 211-217. http://gdmltest.u-ga.fr/item/1028999132/