@article{05304371, title = {Existence criteria and classification schemes for positive solutions of second-order nonlinear difference systems.}, journal = {Discrete Dynamics in Nature and Society}, volume = {2006}, year = {2006}, doi = {10.1155/DDNS/2006/58532}, zbl = {1157.39304}, language = {en}, url = {http://dml.mathdoc.fr/item/05304371} }
Li, Wan-Tong; Huang, Can-Yun; Cheng, Sui Sun. Existence criteria and classification schemes for positive solutions of second-order nonlinear difference systems.. Discrete Dynamics in Nature and Society, Tome 2006 (2006) . doi : 10.1155/DDNS/2006/58532. http://gdmltest.u-ga.fr/item/05304371/