@article{MZM_1975_17_6_a8,
     author = {A. A. Nikonov and V. I. Utkin},
     title = {Extension of dissipative operators in {a~Hilbert} space with an indefinite metric},
     journal = {Matemati\v{c}eskie zametki},
     pages = {909--918},
     publisher = {mathdoc},
     volume = {17},
     number = {6},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1975_17_6_a8/}
}