@article{05063767,
title = {On some classes of Bernstein type operators which preserve the global smoothness in the case of univariate functions.},
journal = {Acta Universitatis Apulensis. Mathematics - Informatics},
volume = {6},
year = {2003},
pages = {91-100},
zbl = {1101.41025},
language = {en},
url = {http://dml.mathdoc.fr/item/05063767}
}
Cleciu, Voichiţa. On some classes of Bernstein type operators which preserve the global smoothness in the case of univariate functions.. Acta Universitatis Apulensis. Mathematics - Informatics, Tome 6 (2003) pp. 91-100. http://gdmltest.u-ga.fr/item/05063767/