TY  - JOUR
AU  - M. N. Yakovlev
TI  - Nonnegative solutions of systems of nonlinear (in particular, difference) equations
JO  - Informatics and Automation
PY  - 1968
SP  - 111
EP  - 116
VL  - 96
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/TRSPY_1968_96_a10/
LA  - ru
ID  - TRSPY_1968_96_a10
ER  -