TY  - JOUR
AU  - S. Yu. Pilyugin
TI  - Cycles in phase portraits of Morse--Smale systems
JO  - Differencialʹnye uravneniâ
PY  - 1977
SP  - 874
EP  - 882
VL  - 13
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1977_13_5_a9/
LA  - ru
ID  - DE_1977_13_5_a9
ER  -