@article{1102784514,
author = {Graef, John R. and Kitamura, Yuichi and Kusano, Takasi and Onose, Hiroshi and Spikes, Paul W.},
title = {On the nonoscillation of perturbed functional-differential equations.},
journal = {Pacific J. Math.},
volume = {85},
number = {2},
year = {1979},
pages = { 365-373},
language = {en},
url = {http://dml.mathdoc.fr/item/1102784514}
}
Graef, John R.; Kitamura, Yuichi; Kusano, Takasi; Onose, Hiroshi; Spikes, Paul W. On the nonoscillation of perturbed functional-differential equations.. Pacific J. Math., Tome 85 (1979) no. 2, pp. 365-373. http://gdmltest.u-ga.fr/item/1102784514/