“…In the last years, a lot of authors have investigated the oscillatory and asymptotic behavior of solutions of different classes of dynamic equations on time scales, and we refer the reader to (Chen & Liu, 2008;Chen, 2010a;Chen, 2010b;Chen & Liu, 2010;Grace et al, 2008;Grace et al, 2009;Hassan, 2008;Karpuz, 2009;Saker, 2005;Saker & O'Regan, 2011;Tripathy, 2009;Xu & Xu, 2009 It is easy to see that the cases considered in (Saker, 2005;Hassan, 2008;Grace et al, 2008;Grace et al, 2009) only are some special cases of (1) and that all the results of (Saker, 2005;Hassan, 2008;Grace et al, 2008;Grace et al, 2009) can not be applied to (1) (Saker, 2005) and (Hassan, 2008). Our results improve and extend some of those in (Saker, 2005;Hassan, 2008;Grace et al, 2008;Grace et al, 2009).…”