@article{article62e1aa6f,
title   = {Periodic solutions of abstract neutral functional differential equations},
author = {Henríquez, Hernán R. and Hernandez, Michelle Fernanda Pierri and Prokopczyk, Andréa},
year = {2012},
doi = {10.1016/j.jmaa.2011.06.078},
journal   = {Journal of Mathematical Analysis and Applications}
}