@article{article5aaeb2a5,
title   = {Extension of the alekseev variation of constant formula for neutral nonlinear perturbed equation with an application to the relative asymptotic equivalence},
author = {Izé, Antonio Fernandes and Ventura, Aldo},
year = {1987},
doi = {10.1016/0022-247x(87)90341-6},
journal   = {Journal of Mathematical Analysis and Aplications}
}