TY  - JOUR
AU  - A. K. Ratyni
TI  - Differential inequalities for the Sturm--Liouville problem
JO  - Differencialʹnye uravneniâ
PY  - 1973
SP  - 456
EP  - 464
VL  - 9
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1973_9_3_a6/
LA  - ru
ID  - DE_1973_9_3_a6
ER  -