@article{00639834,
title = {Periodic solutions to retarded and partial functional differential equations.},
journal = {Portugaliae Mathematica. Nova S\'erie},
volume = {51},
year = {1994},
pages = {271-281},
zbl = {0807.34091},
language = {en},
url = {http://dml.mathdoc.fr/item/00639834}
}
Pavlakos, Panaiotis K.; Stratis, Ioannis G. Periodic solutions to retarded and partial functional differential equations.. Portugaliae Mathematica. Nova Série, Tome 51 (1994) pp. 271-281. http://gdmltest.u-ga.fr/item/00639834/