TY  - JOUR
AU  - A. Ya. Lepin
TI  - Application of topological methods to nonlinear boundary value problems for ordinary differential equations
JO  - Differencialʹnye uravneniâ
PY  - 1969
SP  - 1390
EP  - 1397
VL  - 5
IS  - 8
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1969_5_8_a4/
LA  - ru
ID  - DE_1969_5_8_a4
ER  -