TY  - JOUR
AU  - E. S. Pyatnitskii
AU  - L. B. Rapoport
TI  - A method for constructing invariant functions and the study of phase portraits of dynamical systems on a computer
JO  - Differencialʹnye uravneniâ
PY  - 1990
SP  - 1116
EP  - 1126
VL  - 26
IS  - 7
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1990_26_7_a2/
LA  - ru
ID  - DE_1990_26_7_a2
ER  -