Moaaz, O. and Cesarano, C. 2021. Oscillation results for a certain class of fourth-order nonlinear delay differential equations. Proyecciones (Antofagasta, On line). 40, 2 (Mar. 2021), 505-523. DOI:https://doi.org/10.22199/issn.0717-6279-2021-02-0029.