TY  - JOUR
AU  - Yu. S. Ilyashenko
TI  - The nonalgebraic character of the manifold of differential equations with rational right-hand sides and with multiple limit cycles
JO  - Sbornik. Mathematics
PY  - 1970
SP  - 453
EP  - 457
VL  - 12
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1970_12_3_a6/
LA  - en
ID  - SM_1970_12_3_a6
ER  -