Unbounded oscillation of higher-order nonlinear delay dynamic equations of neutral type with oscillating coefficients. Karpuz, B. — 2009 Electronic Journal of Qualitative Theory of Differential Equations [electronic only]
Iterated oscillation criteria for delay dynamic equations of first order. Bohner, M.; Karpuz, B.; Öcalan, Ö. — 2008 Advances in Difference Equations [electronic only]