@article{02217780,
title = {A preserving property of a Bernardi type operator.},
journal = {General Mathematics},
volume = {9},
year = {2001},
pages = {21-24},
zbl = {1073.30502},
language = {en},
url = {http://dml.mathdoc.fr/item/02217780}
}
Acu, Mugur. A preserving property of a Bernardi type operator.. General Mathematics, Tome 9 (2001) pp. 21-24. http://gdmltest.u-ga.fr/item/02217780/