I.O. Isaac  , Zsolt Lipcsey  , 
    Linearized Oscillations in Nonlinear Neutral Delay Impulsive Differential Equations,
    Journal of Modern Mathematics and Statistics,
    Volume 3,Issue 1,
    2009,
    Pages 1-7,
    ISSN 1994-5388,
    jmmstat.2009.1.7,
    (https://makhillpublications.co/view-article.php?doi=jmmstat.2009.1.7)
    Abstract: Our aim in this study, is to develop a linearized oscillation theory for nonlinear neutral delay impulsive differential equations. Precisely, we prove that a certain nonlinear neutral delay impulsive differential equation has the same oscillatory character as its associated linear impulsive equation.
    Keywords: Linearized oscillations;neutral delay impulsive differential equations