@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/