@article{AA_1990_2_2_a0,
     author = {A. L. Vol'berg and V. V. Peller and D. V. Yakubovich},
     title = {A~brief excursion into the theory of hyponormal operators},
     journal = {Algebra i analiz},
     pages = {1--38},
     publisher = {mathdoc},
     volume = {2},
     number = {2},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_1990_2_2_a0/}
}