1. Agarwal, R., Grace, S., O’Regan, D.: Oscillation Theory for Difference and Functional Differential Equations. Kluwer Academic, Dordrecht (2000)
2. Agarwal, R.P., Bohner, M., Li, T., Zhang, C.: A new approach in the study of oscillatory behavior of even-order neutral delay differential equations. Appl. Math. Comput. 225, 787–794 (2013)
3. Baculikova, B., Dzurina, J., Li, T.: Oscillation results for even-order quasi linear neutral functional differential equations. Electron. J. Differ. Equ. 2011, Article ID 143 (2011)
4. Bazighifan, O., Dassios, I.: On the asymptotic behavior of advanced differential equations with a non-canonical operator. Appl. Sci. 10, Article ID 3130 (2020)
5. Bazighifan, O., Elabbasy, E.M., Moaaz, O.: Oscillation of higher-order differential equations with distributed delay. J. Inequal. Appl. 2019, Article ID 55 (2019)