@article{MZM_1983_33_2_a0,
     author = {M. I. Gil'},
     title = {Estimates of the norm of the resolvent of a non-self-adjoint operator which is ``nearly'' self-adjoint or unitary},
     journal = {Matemati\v{c}eskie zametki},
     pages = {161--167},
     publisher = {mathdoc},
     volume = {33},
     number = {2},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1983_33_2_a0/}
}