@article{04210559,
title = {Existence of periodic solutions of impulsive differential systems.},
journal = {Journal of Applied Mathematics and Stochastic Analysis},
volume = {4},
year = {1991},
pages = {137-146},
doi = {10.1155/S1048953391000102},
zbl = {0732.34008},
language = {en},
url = {http://dml.mathdoc.fr/item/04210559}
}
Erbe, L.H.; Liu, Xinzhi. Existence of periodic solutions of impulsive differential systems.. Journal of Applied Mathematics and Stochastic Analysis, Tome 4 (1991) pp. 137-146. doi : 10.1155/S1048953391000102. http://gdmltest.u-ga.fr/item/04210559/