@article{articleb6130822,
title   = {Periodic solutions and stability for a singularly perturbed linear delay differential equation},
author = {Cruz, José Hilário da and Taboas, Placido Zoega},
year = {2007},
doi = {10.1016/j.na.2006.08.004},
journal   = {Nonlinear Analysis : Theory, Methods and Applications}
}