@article{05690935, title = {Variational approaches for the existence of multiple periodic solutions of differential delay equations.}, journal = {Abstract and Applied Analysis}, volume = {2010}, year = {2010}, doi = {10.1155/2010/978137}, zbl = {1195.34104}, language = {en}, url = {http://dml.mathdoc.fr/item/05690935} }
Cheng, Rong; Hu, Jianhua. Variational approaches for the existence of multiple periodic solutions of differential delay equations.. Abstract and Applied Analysis, Tome 2010 (2010) . doi : 10.1155/2010/978137. http://gdmltest.u-ga.fr/item/05690935/