Jinzhu Zhang Zhen Jin Huimin Zhang Existence of Nonoscillatory Solution for Second Order Nonlinear Neutral Delay Differential Equation. 339-342 2007 SNPD (2) http://doi.ieeecomputersociety.org/10.1109/SNPD.2007.274 conf/snpd/2007 db/conf/snpd/snpd2007-2.html#ZhangJZ07