@article{01704024,
title = {Oscillation of two delays differential equations with positive and negative coefficients.},
journal = {Mathematica Pannonica},
volume = {12},
year = {2001},
pages = {225-234},
zbl = {1002.34060},
language = {en},
url = {http://dml.mathdoc.fr/item/01704024}
}
Lakrib, Mustapha. Oscillation of two delays differential equations with positive and negative coefficients.. Mathematica Pannonica, Tome 12 (2001) pp. 225-234. http://gdmltest.u-ga.fr/item/01704024/