@article{bwmeta1.element.bwnjournal-article-smv23i1p7bwm,
author = {G. Freud and S. Knapowski},
title = {On linear processes of approximation (I)},
journal = {Studia Mathematica},
volume = {23},
year = {1963},
pages = {105-112},
zbl = {0128.06406},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-smv23i1p7bwm}
}
Freud, G.; Knapowski, S. On linear processes of approximation (I). Studia Mathematica, Tome 23 (1963) pp. 105-112. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-smv23i1p7bwm/