Consider the first-order linear delay differential equation\begin{equation*}x^{\prime }(t)+p(t)x(\tau (t))=0,\;\;\;t\geq t_{0},\eqno(1)\end{equation*}%where $p,\tau \in C([t_{0},\infty )$, $\mathbb{R}^{+}$), $\tau (t)$ isnondecreasing, $\tau (t)
@article{26, title = {On the oscillation of the solutions to delay and difference equations}, journal = {Tatra Mountains Mathematical Publications}, volume = {43}, year = {2009}, doi = {10.2478/tatra.v43i0.26}, language = {EN}, url = {http://dml.mathdoc.fr/item/26} }
Niri, Khadija; Stavroulakis, Ioannis P. On the oscillation of the solutions to delay and difference equations. Tatra Mountains Mathematical Publications, Tome 43 (2009) . doi : 10.2478/tatra.v43i0.26. http://gdmltest.u-ga.fr/item/26/