@article{NSJOM_2009_39_2a_6,
     author = {B. Belaidi and A. El Farissi},
     title = {Growth and

 oscillation theories of differential polynomials},
     journal = {Novi Sad Journal of Mathematics},
     pages = {61-70},
     publisher = {mathdoc},
     volume = {39},
     number = {2},
     year = {2009},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_2009_39_2a_6/}
}