References
- Agarwal , RP and Regan , DO' . 1997 . Existence Theory for Nonlinear Ordinary Differential Equations , Dordrecht : Kluwer .
- Agarwal , RP and Regan , DO' . 1998 . Singular discrete boundary value problems . Appl. Math. Lett. , 28 : 767 – 791 .
- Agarwal , RP and Regan , DO' . 2000 . A coupled system of difference equations . Appl. Math. Comp. , 114 : 39 – 49 .
- Chyan , CJ and Henderson , J . 1994 . Positive solutions for singular higher order non-linear equations . Diff. Equ. Dyn. Sys. , 2 : 153 – 160 .
- Yuan , C , Jiang , D and Zhang , Y . 2008 . Existence and uniqueness of solutions for singular higher order continuous and discrete boundary value problems . Bound. Value Prob. , 2008 : 11 Article ID 123823, doi:10.1155/2008/123823
- Guo , D . 2000 . The Order Methods in Non-linear Analysis (in Chinese) , Jinan : Shangdong Technical and Science Press .