@article{01409116,
title = {Oscillation of solutions to delay differential equations with positiv and negative coefficients.},
journal = {Electronic Journal of Differential Equations (EJDE) [electronic only]},
volume = {2000},
year = {2000},
zbl = {0944.34056},
language = {en},
url = {http://dml.mathdoc.fr/item/01409116}
}
Elabbasy, El M.; Hegazi, A.S.; Saker, S.H. Oscillation of solutions to delay differential equations with positiv and negative coefficients.. Electronic Journal of Differential Equations (EJDE) [electronic only], Tome 2000 (2000) . http://gdmltest.u-ga.fr/item/01409116/