TY  - JOUR
AU  - Yu. A. Pykh
TI  - Differential systems with non-negative normed solutions
JO  - Differencialʹnye uravneniâ
PY  - 1977
SP  - 1138
EP  - 1140
VL  - 13
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1977_13_6_a22/
LA  - ru
ID  - DE_1977_13_6_a22
ER  -