@article{05575270,
title = {Existence of periodic solutions for a delayed ratio-dependent three-species predator-prey diffusion system on time scales.},
journal = {Advances in Difference Equations [electronic only]},
volume = {2009},
year = {2009},
doi = {10.1155/2009/141589},
zbl = {1171.34057},
language = {en},
url = {http://dml.mathdoc.fr/item/05575270}
}
Liu, Zhenjie. Existence of periodic solutions for a delayed ratio-dependent three-species predator-prey diffusion system on time scales.. Advances in Difference Equations [electronic only], Tome 2009 (2009) . doi : 10.1155/2009/141589. http://gdmltest.u-ga.fr/item/05575270/