@article{02187286,
title = {Existence of periodic orbits for vector fields via Fuller index and the averaging method.},
journal = {Electronic Journal of Differential Equations (EJDE) [electronic only]},
volume = {2004},
year = {2004},
zbl = {1076.34044},
language = {en},
url = {http://dml.mathdoc.fr/item/02187286}
}
Benevieri, Pierluigi; Gavioli, Andrea; Villarini, Massimo. Existence of periodic orbits for vector fields via Fuller index and the averaging method.. Electronic Journal of Differential Equations (EJDE) [electronic only], Tome 2004 (2004) . http://gdmltest.u-ga.fr/item/02187286/