... for Boundary Value Problems of Second-OrderFour-Point Functional Difference EquationsYang Shujie and Shi BaoInstitute of Systems Science and Mathematics, Naval Aeronautical and Astronautical University, ... Foundation of Naval Aeronautical and AstronauticalUniversity.References1 M. J. Gai, B. Shi, and D. C. Zhang, “Boundary value problems for second-order singular functionaldifferential equations,” ... Mathematicae, vol. 110, no. 3, pp. 1277–1287, 2009.6 S. K. Ntouyas, Y. G. Sficas, and P. Ch. Tsamatos, “Boundary value problems for functional-differentialequations,” Journal of Mathematical...