TY  - JOUR
AU  - V. I. Feigin
TI  - Estimates of the length of gaps in the spectrum of a~first-order system
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1979
SP  - 198
EP  - 199
VL  - 34
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/RM_1979_34_3_a6/
LA  - en
ID  - RM_1979_34_3_a6
ER  -