Grammatikopoulos, M. K.; Ladas, G.; Sficas, Y. G. Oscillation and asymptotic behavior of neutral equations with variable coefficients. (English) Zbl 0617.34067 Rad. Mat. 2, 279-303 (1986). The authors discuss the delay equation \([y(t)+P(t)y(t- \tau)]^{\bullet}+Q(t)y(t-\sigma)=0.\) The asymptotic properties of nonoscillatory solutions are studied and sufficient conditions are given to insure that all solutions are oscillatory. Many examples are given. Reviewer: E.Heil Cited in 1 ReviewCited in 18 Documents MSC: 34K99 Functional-differential equations (including equations with delayed, advanced or state-dependent argument) 34C10 Oscillation theory, zeros, disconjugacy and comparison theory for ordinary differential equations Keywords:nonoscillatory solutions; examples PDFBibTeX XMLCite \textit{M. K. Grammatikopoulos} et al., Rad. Mat. 2, 279--303 (1986; Zbl 0617.34067)