@article{1273779437,
author = {Takahasi, Sin-Ei},
title = {Bohman-Korovkin-Wulbert Operators on $C[0.1]$ For $\{1,x,x^{2},x^{3}, x^{4}\}$},
journal = {Nihonkai Math. J.},
volume = {1},
number = {1},
year = {1990},
pages = { 155-160},
language = {en},
url = {http://dml.mathdoc.fr/item/1273779437}
}
Takahasi, Sin-Ei. Bohman-Korovkin-Wulbert Operators on $C[0.1]$ For $\{1,x,x^{2},x^{3}, x^{4}\}$. Nihonkai Math. J., Tome 1 (1990) no. 1, pp. 155-160. http://gdmltest.u-ga.fr/item/1273779437/