TY  - JOUR
AU  - Yu. A. Kuznetsov
AU  - S. B. Sorokin
TI  - The method of two-sided approximations in eigenvalue problems
JO  - Differencialʹnye uravneniâ
PY  - 1979
SP  - 914
EP  - 920
VL  - 15
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1979_15_5_a16/
LA  - ru
ID  - DE_1979_15_5_a16
ER  -