@article{01780534,
title = {Positive periodic solutions of nonautonomous functional differential equations depending on a parameter.},
journal = {Abstract and Applied Analysis},
volume = {7},
year = {2002},
pages = {279-286},
doi = {10.1155/S1085337502000878},
zbl = {1007.34066},
language = {en},
url = {http://dml.mathdoc.fr/item/01780534}
}
Zhang, Guang; Cheng, Sui Sun. Positive periodic solutions of nonautonomous functional differential equations depending on a parameter.. Abstract and Applied Analysis, Tome 7 (2002) pp. 279-286. doi : 10.1155/S1085337502000878. http://gdmltest.u-ga.fr/item/01780534/