@article{MZM_2016_100_6_a14,
     author = {A. A. Shkalikov and C. Trunk},
     title = {On {Stability} of {Closedness} and {Self-Adjointness} for $2\times 2$ {Operator} {Matrices}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {932--938},
     publisher = {mathdoc},
     volume = {100},
     number = {6},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2016_100_6_a14/}
}