@article{02113407,
title = {Formulas of variation for a solution of neutral differential equations with continuous initial condition.},
journal = {Georgian Mathematical Journal},
volume = {11},
year = {2004},
pages = {155-175},
zbl = {1065.34080},
language = {en},
url = {http://dml.mathdoc.fr/item/02113407}
}
Ramishvili, I.; Tadumadze, T. Formulas of variation for a solution of neutral differential equations with continuous initial condition.. Georgian Mathematical Journal, Tome 11 (2004) pp. 155-175. http://gdmltest.u-ga.fr/item/02113407/