@article{02100339,
title = {Structural stability of polynomial second order differential equations with periodic coefficients.},
journal = {Electronic Journal of Differential Equations (EJDE) [electronic only]},
volume = {2004},
year = {2004},
zbl = {1053.37009},
language = {en},
url = {http://dml.mathdoc.fr/item/02100339}
}
Guzman, Adolfo W. Structural stability of polynomial second order differential equations with periodic coefficients.. Electronic Journal of Differential Equations (EJDE) [electronic only], Tome 2004 (2004) . http://gdmltest.u-ga.fr/item/02100339/