@ARTICLE{
author={Karpuz B,Manojlovic Jelena V,Oecalan Oe,Shoukaku Y},
year={2009},
title={Oscillation criteria for a class of second-order neutral delay differential equations},
journal={APPLIED MATHEMATICS AND COMPUTATION},
volume={210},
number={2},
pages={303-312},
document_type={Article},
} 

@ARTICLE{
author={Manojlovic Jelena V,Shoukaku Y,Tanigawa T,Yoshida N},
year={2006},
title={Oscillation criteria for second order differential equations with positive and negative coefficients},
journal={APPLIED MATHEMATICS AND COMPUTATION},
volume={181},
number={2},
pages={853-863},
document_type={Article},
}