TY  - JOUR
AU  - V. A. Erovenko
TI  - Lacunae in the spectrum of a fourth order differenetial operator with periodic coefficients
JO  - Differencialʹnye uravneniâ
PY  - 1975
SP  - 1942
EP  - 1948
VL  - 11
IS  - 11
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1975_11_11_a3/
LA  - ru
ID  - DE_1975_11_11_a3
ER  -