TY  - JOUR
AU  - Yu. A. Klokov
TI  - On Upper and Lower Functions for a Fourth-Order Ordinary Differential Equation: I
JO  - Differencialʹnye uravneniâ
PY  - 2005
SP  - 1074
EP  - 1083
VL  - 41
IS  - 8
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_2005_41_8_a7/
LA  - ru
ID  - DE_2005_41_8_a7
ER  -