Thandapani, E., S. Padmavathi, and Sandra Pinelas. “Oscillation Criteria For Even Order Nonlinear Neutral Differential Equations With Mixed Arguments”. JOURNAL OF ADVANCES IN MATHEMATICS 5, no. 1 (December 16, 2013): 575–589. Accessed May 12, 2024. https://rajpub.com/index.php/jam/article/view/3669.