TY  - JOUR
AU  - Guzman,  Adolfo W.
TI  - Structural stability of polynomial second order differential equations with periodic coefficients
JO  - Electronic journal of differential equations
PY  - 2004
VL  - 2004
UR  - http://geodesic.mathdoc.fr/item/EJDE_2004__2004__a69/
LA  - en
ID  - EJDE_2004__2004__a69
ER  -