@article{AA_1999_11_4_a8,
     author = {J. B. Farforovskaja},
     title = {Estimates for the commutators of normal operators},
     journal = {Algebra i analiz},
     pages = {204--221},
     year = {1999},
     volume = {11},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_1999_11_4_a8/}
}