Copyright © 2010 Zhenlai Han et al. This is an open access article distributed under the
Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Some new oscillation criteria for the second-order neutral delay
differential equation , are established, where , , , . These oscillation criteria extend and improve some known results. An example is
considered to illustrate the main results.