@article{IM2_1973_7_3_a9,
     author = {T. Ya. Azizov},
     title = {Dissipative operators in {a~Hilbert} space with an indefinite metric},
     journal = {Izvestiya. Mathematics},
     pages = {639--660},
     year = {1973},
     volume = {7},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1973_7_3_a9/}
}