@article{01823765,
title = {Integral averaging techniques for oscillation of second order nonlinear differential equations with damping.},
journal = {Publications de l'Institut Math\'ematique. Nouvelle S\'erie},
volume = {68(82)},
year = {2000},
pages = {92-104},
zbl = {1012.34032},
language = {en},
url = {http://dml.mathdoc.fr/item/01823765}
}
Manojlović, Jelena. Integral averaging techniques for oscillation of second order nonlinear differential equations with damping.. Publications de l'Institut Mathématique. Nouvelle Série, Tome 68(82) (2000) pp. 92-104. http://gdmltest.u-ga.fr/item/01823765/