@article{FAA_1998_32_4_a12,
     author = {V. M. Manuilov},
     title = {An {Invariant} of a {Pair} of {Almost} {Commuting} {Unbounded} {Operators}},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {88--91},
     publisher = {mathdoc},
     volume = {32},
     number = {4},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1998_32_4_a12/}
}