@article{05897799, title = {Multiple periodic solutions for difference equations with double resonance at infinity.}, journal = {Advances in Difference Equations [electronic only]}, volume = {2011}, year = {2011}, doi = {10.1155/2011/806458}, zbl = {1213.39016}, language = {en}, url = {http://dml.mathdoc.fr/item/05897799} }
Zhang, Xiaosheng; Wang, Duo. Multiple periodic solutions for difference equations with double resonance at infinity.. Advances in Difference Equations [electronic only], Tome 2011 (2011) . doi : 10.1155/2011/806458. http://gdmltest.u-ga.fr/item/05897799/