@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/