@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/