@article{02204836, title = {Positive periodic solutions for nonlinear difference equations via a continuation theorem.}, journal = {Advances in Difference Equations [electronic only]}, volume = {2004}, year = {2004}, pages = {311-320}, doi = {10.1155/S1687183904308113}, zbl = {1095.39011}, language = {en}, url = {http://dml.mathdoc.fr/item/02204836} }
Wang, Gen-Qiang; Cheng, Sui Sun. Positive periodic solutions for nonlinear difference equations via a continuation theorem.. Advances in Difference Equations [electronic only], Tome 2004 (2004) pp. 311-320. doi : 10.1155/S1687183904308113. http://gdmltest.u-ga.fr/item/02204836/