@article{SM_2012_203_2_a4,
     author = {S. G. Pyatkov},
     title = {On the existence of maximal semidefinite invariant subspaces for $J$-dissipative operators},
     journal = {Sbornik. Mathematics},
     pages = {234--256},
     publisher = {mathdoc},
     volume = {203},
     number = {2},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2012_203_2_a4/}
}