TY  - JOUR
AU  - R. S. Ismagilov
AU  - V. V. Martynov
TI  - A criterion for the discreteness of the spectrum of a selfadjoint system of differential equations of the first order with slowly varying coefficients
JO  - Doklady Akademii Nauk
PY  - 1966
SP  - 1223
EP  - 1225
VL  - 167
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1966_167_6_a2/
LA  - ru
ID  - DAN_1966_167_6_a2
ER  -