Interval oscillation criteria for second order neutral nonlinear differential equations. - Rong-Kun Zhuang; Wan-Tong Li (Appl. Math. Comput., 2004)

Sturm comparison theorem of solution for second order nonlinear differential equations. - Rong-Kun Zhuang; Hong-Wu Wu (Appl. Math. Comput., 2005)

Oscillation criteria for second-order nonlinear neutral variable delay dynamic equations. - Hong-Wu Wu; Rong-Kun Zhuang; Ronald M. Mathsen (Appl. Math. Comput., 2006)