@article{02220832,
title = {Positive periodic solutions of a discrete mutualism model with time delays.},
journal = {International Journal of Mathematics and Mathematical Sciences},
volume = {2005},
year = {2005},
pages = {499-506},
doi = {10.1155/IJMMS.2005.499},
zbl = {1081.92042},
language = {en},
url = {http://dml.mathdoc.fr/item/02220832}
}
Li, Yongkun. Positive periodic solutions of a discrete mutualism model with time delays.. International Journal of Mathematics and Mathematical Sciences, Tome 2005 (2005) pp. 499-506. doi : 10.1155/IJMMS.2005.499. http://gdmltest.u-ga.fr/item/02220832/