@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/