Under weaker hypothesis, we use the Schauder-Tychonoff theorem to obtain new sufficient condition for the global existence of oscillatory solutions for forced second order nonlinear delay differential equations with distributed deviating arguments.
"Existence of Oscillatory Solutions of Second Order Delay Differential Equations with Distributed Deviating Arguments." Abstr. Appl. Anal. 2013 1 - 6, 2013. https://doi.org/10.1155/2013/731021