TY  - JOUR
AU  - V. M. Manuilov
TI  - An Invariant of a Pair of Almost Commuting Unbounded Operators
JO  - Funkcionalʹnyj analiz i ego priloženiâ
PY  - 1998
SP  - 88
EP  - 91
VL  - 32
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/FAA_1998_32_4_a12/
LA  - ru
ID  - FAA_1998_32_4_a12
ER  -