The distribution of zeros of solutions of neutral differential equations. - Hong-Wu Wu; Yuan-Tong Xu (Appl. Math. Comput., 2004)

Multiple periodic solutions to a class of second-order nonlinear mixed-type functional differential equations. - Xiao-Bao Shu; Yuan-Tong Xu (Int. J. Math. Math. Sci., 2005)

Riccati techniques and oscillation for self-adjoint matrix Hamiltonian systems. - Qi-Ru Wang; Yuan-Tong Xu; Ronald M. Mathsen (Comput. Math. Appl., 2009)