@article{05701457,
title = {Multiple positive periodic solutions for delay differential system.},
journal = {Discrete Dynamics in Nature and Society},
volume = {2009},
year = {2009},
doi = {10.1155/2009/239209},
zbl = {1201.34106},
language = {en},
url = {http://dml.mathdoc.fr/item/05701457}
}
Hao, Zhao-Cai; Xiao, Ti-Jun; Liang, Jin. Multiple positive periodic solutions for delay differential system.. Discrete Dynamics in Nature and Society, Tome 2009 (2009) . doi : 10.1155/2009/239209. http://gdmltest.u-ga.fr/item/05701457/