@article{01348671,
title = {A simple functional operator.},
journal = {The New York Journal of Mathematics [electronic only]},
volume = {5},
year = {1999},
pages = {139-142},
zbl = {0933.39047},
language = {en},
url = {http://dml.mathdoc.fr/item/01348671}
}
Risteski, Ice B.; Trenčevski, Kostadin G.; Covachev, Valéry C. A simple functional operator.. The New York Journal of Mathematics [electronic only], Tome 5 (1999) pp. 139-142. http://gdmltest.u-ga.fr/item/01348671/