TY  - JOUR
AU  - Ph. Hartman
TI  - On boundary value problems for systems of ordinary, nonlinear, second order differential equations
JO  - Matematika
PY  - 1962
SP  - 69
EP  - 86
VL  - 6
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MAT_1962_6_5_a6/
LA  - ru
ID  - MAT_1962_6_5_a6
ER  -