@article{05312427, title = {On periodic solutions of higher-order functional differential equations.}, journal = {Boundary Value Problems [electronic only]}, volume = {2008}, year = {2008}, doi = {10.1155/2008/389028}, zbl = {1154.34035}, language = {en}, url = {http://dml.mathdoc.fr/item/05312427} }
Kiguradze, I.; Partsvania, N.; Půža, B. On periodic solutions of higher-order functional differential equations.. Boundary Value Problems [electronic only], Tome 2008 (2008) . doi : 10.1155/2008/389028. http://gdmltest.u-ga.fr/item/05312427/