@article{05714000,
title = {Positive periodic solutions for nonautonomous impulsive neutral functional differential systems with time-varying delays on time scales.},
journal = {Electronic Journal of Differential Equations (EJDE) [electronic only]},
volume = {2010},
year = {2010},
zbl = {1201.34101},
language = {en},
url = {http://dml.mathdoc.fr/item/05714000}
}
Dai, Jinchun; Li, Yongkun; Zhang, Tianwei. Positive periodic solutions for nonautonomous impulsive neutral functional differential systems with time-varying delays on time scales.. Electronic Journal of Differential Equations (EJDE) [electronic only], Tome 2010 (2010) . http://gdmltest.u-ga.fr/item/05714000/