On the monotonic properties and oscillatory behavior of solutions of neutral differential equations (Q6184652)

Oscillatory and asymptotic properties are studied for the following delay differential equation of even order \[ (\ell(u)(w^{(n-1)}(u))^r)'+q(u)x^r(\varrho(u))=0, \] where $w=x+p\cdot (x\circ \tau)$, under some assumptions on $r$, $p$, $n$, $\varrho$, $\tau$, and $\ell$.