@article{02171593,
title = {Sufficient and necessary condition for the permanence of periodic predator-prey system.},
journal = {International Journal of Mathematics and Mathematical Sciences},
volume = {2004},
year = {2004},
pages = {2307-2323},
doi = {10.1155/S016117120430133X},
zbl = {1078.92063},
language = {en},
url = {http://dml.mathdoc.fr/item/02171593}
}
Cui, Jingan; Song, Xinyu. Sufficient and necessary condition for the permanence of periodic predator-prey system.. International Journal of Mathematics and Mathematical Sciences, Tome 2004 (2004) pp. 2307-2323. doi : 10.1155/S016117120430133X. http://gdmltest.u-ga.fr/item/02171593/