@article{AA_2009_21_1_a1,
     author = {M. N. Daif and M. S. Tammam El-Sayiad},
     title = {On $\theta$-centralizers of semiprime {rings~(II)}},
     journal = {Algebra i analiz},
     pages = {61--73},
     publisher = {mathdoc},
     volume = {21},
     number = {1},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AA_2009_21_1_a1/}
}