@article{02206409,
title = {Approximation of functions of two variables by some linear positive operators.},
journal = {Acta Mathematica Universitatis Comenianae. New Series},
volume = {74},
year = {2005},
pages = {37-48},
zbl = {1112.41021},
language = {en},
url = {http://dml.mathdoc.fr/item/02206409}
}
Walczak, Z. Approximation of functions of two variables by some linear positive operators.. Acta Mathematica Universitatis Comenianae. New Series, Tome 74 (2005) pp. 37-48. http://gdmltest.u-ga.fr/item/02206409/