@article{05038338, title = {Positive periodic solutions of functional discrete systems and population models.}, journal = {Advances in Difference Equations [electronic only]}, volume = {2005}, year = {2005}, pages = {369-380}, doi = {10.1155/ADE.2005.369}, zbl = {1111.39008}, language = {en}, url = {http://dml.mathdoc.fr/item/05038338} }
Raffoul, Youssef N.; Tisdell, Christopher C. Positive periodic solutions of functional discrete systems and population models.. Advances in Difference Equations [electronic only], Tome 2005 (2005) pp. 369-380. doi : 10.1155/ADE.2005.369. http://gdmltest.u-ga.fr/item/05038338/