@article{05561904,
title = {Positive periodic solutions for an impulsive ratio-dependent predator-prey system with delays.},
journal = {Electronic Journal of Differential Equations (EJDE) [electronic only]},
volume = {2008},
year = {2008},
zbl = {1176.34102},
language = {en},
url = {http://dml.mathdoc.fr/item/05561904}
}
Liu, Yan; Wang, Quanyi. Positive periodic solutions for an impulsive ratio-dependent predator-prey system with delays.. Electronic Journal of Differential Equations (EJDE) [electronic only], Tome 2008 (2008) . http://gdmltest.u-ga.fr/item/05561904/