@article{05030266,
title = {Averaging technique and oscillation for even order damped delay differential equations.},
journal = {Portugaliae Mathematica. Nova S\'erie},
volume = {63},
year = {2006},
pages = {23-36},
zbl = {1103.34058},
language = {en},
url = {http://dml.mathdoc.fr/item/05030266}
}
Xu, Zhiting. Averaging technique and oscillation for even order damped delay differential equations.. Portugaliae Mathematica. Nova Série, Tome 63 (2006) pp. 23-36. http://gdmltest.u-ga.fr/item/05030266/