@article{02217792,
title = {On the rate of convergence of certain approximation operators.},
journal = {General Mathematics},
volume = {10},
year = {2002},
pages = {85-89},
zbl = {1073.41509},
language = {en},
url = {http://dml.mathdoc.fr/item/02217792}
}
Popa, Emil C. On the rate of convergence of certain approximation operators.. General Mathematics, Tome 10 (2002) pp. 85-89. http://gdmltest.u-ga.fr/item/02217792/