TY  - JOUR
AU  - V. S. Mokeichev
TI  - In the perturbation of a boundary value problem by terms with deviating argument the spectrum can vanish
JO  - Differencialʹnye uravneniâ
PY  - 1983
SP  - 717
EP  - 718
VL  - 19
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1983_19_4_a28/
LA  - ru
ID  - DE_1983_19_4_a28
ER  -