TY  - JOUR
AU  - A. S. Markus
AU  - V. I. Matsaev
TI  - A~theorem on comparison of spectra, and spectral asymptotics for a~Keldysh pencil
JO  - Sbornik. Mathematics
PY  - 1985
SP  - 389
EP  - 404
VL  - 51
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1985_51_2_a4/
LA  - en
ID  - SM_1985_51_2_a4
ER  -