@article{article7d052001,
title   = {Existence results for neutral integro-differential equations with unbounded delay},
author = {Santos, José Paulo C. dos and Henríquez, Hernán and Hernández, Eduardo},
year = {2011},
doi = {10.1216/jie-2011-23-2-289},
journal   = {Journal of Integral Equations and Applications}
}