On the nonoscillation of second-order neutral delay differential equation with forcing term. Zhang, Jin-Zhu; Jin, Zhen; Su, Tie-Xiong; Wang, Jian-Jun; Zhang, Zhi-Yu; Yan, Ju-Rang — 2008 Discrete Dynamics in Nature and Society
Oscillation and global attractivity in a nonlinear delay difference equation Deng Hua Cheng; Ju Rang Yan — 2000 Mathematica Slovaca