TY  - JOUR
AU  - I. Ts. Gokhberg
AU  - E. I. Sigal
TI  - An operator generalization of the logarithmic residue theorem and the theorem of Rouch\'e
JO  - Sbornik. Mathematics
PY  - 1971
SP  - 603
EP  - 625
VL  - 13
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1971_13_4_a7/
LA  - en
ID  - SM_1971_13_4_a7
ER  -