TY  - JOUR
AU  - I. S. Kats
TI  - Some general theorems on the behaviour of spectral functions of second order differential systems
JO  - Doklady Akademii Nauk
PY  - 1958
SP  - 974
EP  - 977
VL  - 122
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1958_122_6_a4/
LA  - ru
ID  - DAN_1958_122_6_a4
ER  -