Zi Xue-ping. The Existence of Nonoscillatory Solutions to Higher Order Nonlinear Neutral Differential Equations[J]. 2013, 30(4): 111-115.DOI: 10.3969/j.issn.1007-7162.2013.04.021.
It studies the existence of nonoscillatory solutions of variable coefficient higher order nonlinear neutral differential equations by the Banach contraction principle. Some new sufficient conditions have been obtained